https://peertube.v1.root42.de/about/instance/homehttps://peertube.v1.root42.de/videos/browse?scope=localhttps://peertube.v1.root42.de/w/rcn5wahYoamFEGtRKBcVCShttps://peertube.v1.root42.de/lazy-static/thumbnails/7ad4acb0-9dc1-4fb0-9de8-472a4321898c.jpgLet's Talk 0x01: LLMs and AII have to chime in when it comes to the topic that just doesn't want to die: LLMs and AI. What do I see as the issues with LLMs? Are they ok for use in retro computing projects? Are LLMs the work of the devil? Of course, there will be lots of opinions from myself in this video, but I try to be as objective as I can. Join me on Mastodon: https://chaos.social/@root42https://peertube.v1.root42.de/static/streaming-playlists/hls/cc0aa340-b860-4f25-accf-331f89f32956/ab5f3892-46bd-4bc6-9bf7-392624090ba3-master.m3u8https://peertube.v1.root42.de/videos/embed/rcn5wahYoamFEGtRKBcVCS16450102026-08-03T15:09:45.723ZletstalkllmaiYESroot42NOhttps://peertube.v1.root42.de/w/6tjK4woYavGRyeBoVuA7Fqhttps://peertube.v1.root42.de/lazy-static/thumbnails/27f4cfd1-b054-4dd5-a202-d67dc18949b5.jpgThe ReSeed SID Sound Card for the Plus/4 & C16The Commodore 264 machines, which include the Plus/4 and the C16 used the TED chip for video and sound. The audio capabilities were not great: two square wave channels. The Commodore 64’s SID chip on the other hand was a proper three voice synthesizer. So back in the day there was a cartridge for the Plus/4 using the SID and eventually games and demos using this were published. These cards are pretty rare, but now there is a homebrew clone of the card! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Project Page: https://github.com/SukkoPera/ReSeed Software: https://plus4world.powweb.com/effects/SID_Support 0:00 Introduction 5:55 Assembly 11:36 Calibration & feature comparison 22:22 Lykia demonstration 27:02 Shade demo 29:03 False Idols demo 31:32 Closing words #retrogaming #retrocomputing #commodorehttps://peertube.v1.root42.de/static/streaming-playlists/hls/2c4e5355-5698-4257-8f51-48b8d3ffb2f6/de5653e4-3318-45e7-b432-a3cbcc863466-master.m3u8https://peertube.v1.root42.de/videos/embed/6tjK4woYavGRyeBoVuA7Fq2157002026-08-04T08:25:46.534ZYESroot42NOhttps://peertube.v1.root42.de/w/pZTTM9vAtXAoJEcVfKuQXUhttps://peertube.v1.root42.de/lazy-static/thumbnails/4ec8d68c-e48b-42f9-b07b-03ea0e0ba526.jpgLet's Code MS DOS 0x22: 2nd Reality Tunnel EffectIn 1993 the Future Crew released the seminal demo “Second Reality”. One of the more simple effects they showed in this demo was the “Dot Tunnel”. It is a simple, yet mesmerizing oldskool demo effect. We can build on our knowledge of fixed point maths to implement this effect and maybe even improve on the original! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source code: https://github.com/root42/dostunnl 0:00 Introduction 1:20 The Code Stub 3:15 Lissajous 8:40 Precomputed Tunnel 16:20 Drawing The Tunnel 24:12 THE DEMO 26:00 Closing words #demoscene #letscode #msdos #retrocomputing #programminghttps://peertube.v1.root42.de/static/streaming-playlists/hls/c2579068-f37b-4f9c-b99b-e076bf4fc0fa/38b38aa6-d4b3-4211-beac-b020d7ca7c97-master.m3u8https://peertube.v1.root42.de/videos/embed/pZTTM9vAtXAoJEcVfKuQXU1790002026-08-04T08:27:26.645ZYESroot42NOhttps://peertube.v1.root42.de/w/7HsWegd17rcG3gjxhWqi4Whttps://peertube.v1.root42.de/lazy-static/thumbnails/9c34bbd0-7526-4a27-9098-0b20e7f516d9.jpgLet's Code MS DOS 0x23: 2nd Reality Lens EffectIn 1993 the Future Crew released the seminal demo “Second Reality”. Last episode we re-implemented the tunnel effect, this time we try to understand and replicate the lens effect. A bouncing, tinted glass ball that distorts the background image. Thirty years back it was pretty jaw dropping, and even today we can learn something! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source code: https://github.com/root42/doslens https://peertube.v1.root42.de/static/streaming-playlists/hls/3660ed01-2d42-49b1-a975-8552d9d0d928/f250bc0a-3f1a-4713-aa6b-6fbe3ebd77ee-master.m3u8https://peertube.v1.root42.de/videos/embed/7HsWegd17rcG3gjxhWqi4W2244002026-08-04T08:29:50.550ZYESroot42NOhttps://peertube.v1.root42.de/w/81Uu4EwRZBKRbphRAnzJuihttps://peertube.v1.root42.de/lazy-static/thumbnails/6195167b-4a99-4603-81e4-e5b19080c102.jpgC64 Black Screen RepairA friend brought over his childhood Breadbin C64. Of course it was dead — black screen. This can be caused by a multitude of issues. My money initially was on the PLA — as is so often the case! But is the PLA really the culprit this time…? Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/38d0509f-ef49-4247-9e10-610e9b642049/66ef6063-1555-4b3a-b6e1-3bcb228885ef-master.m3u8https://peertube.v1.root42.de/videos/embed/81Uu4EwRZBKRbphRAnzJui1515002026-08-04T08:32:15.150ZYESroot42NOhttps://peertube.v1.root42.de/w/cmU6phb6h5KhMLbBVe67skhttps://peertube.v1.root42.de/lazy-static/thumbnails/643f470b-9f1e-4d78-89ea-41d364a9087c.jpgLet's Code MS DOS 0x24: Low Level Keyboard ProgrammingGetting input from the keyboard can be as easy as calling the getch() function. But for games we need a better solution. For games on MS DOS machines you need quick, unbuffered input. To simply get the state of keypresses we need to talk to the keyboard controller directly. Let’s have a look at how that’s done! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Source code: https://github.com/root42/doskbc Previous episodes: Keyboard: https://youtu.be/Y0nT_6RF4NI Sound Blaster: https://youtu.be/dqeLS6Tv2Lo IRQ Handling: https://youtu.be/isgjKcvGDSk Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/5bff8112-9844-456c-9d2d-1cdf6a2f9547/5b781ee4-6c52-4769-b561-166f29ad0147-master.m3u8https://peertube.v1.root42.de/videos/embed/cmU6phb6h5KhMLbBVe67sk1581002026-08-04T08:33:39.895ZYESroot42NOhttps://peertube.v1.root42.de/w/5xD5KzwGPbeFmmRQ5Eydpahttps://peertube.v1.root42.de/lazy-static/thumbnails/7673e3e1-db73-414d-96bd-1507e924d0f8.jpgI Broke A Vintage Floppy Drive MotorMy Commodore 8050 drive died two months ago, while being attached to a IEEE-USB interface. It seems the read-head of drive 0 was driven too far. After fixing that issue, I noticed that drive 1 wasn’t formatting disks — again. Suspecting that the DC motor for the drive might have an issue, I wanted to open it up to do maintenance. A bad decision… Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/24cf76cc-4e84-4147-8e32-08c987865d4f/0f140ac8-1a9e-4e7f-be5a-9366fc27cc75-master.m3u8https://peertube.v1.root42.de/videos/embed/5xD5KzwGPbeFmmRQ5Eydpa790002026-08-04T08:34:55.223ZYESroot42NOhttps://peertube.v1.root42.de/w/5f7F8BtKEo7RD5o7SSMYQfhttps://peertube.v1.root42.de/lazy-static/thumbnails/0c369479-798f-4906-a36e-bad9b67c5f86.jpgZoomFloppy+OpenCBM+8050The main issue with the Commodore 8050 and 8250 drives is: How do you get data onto them? The units use 100tpi floppy drives that are incompatible to the regular 48tpi and 96tpi disk drives used in the 1541 and in PC DD and HD drives. So there is no chance using those. However there is the ZoomFloppy, which is an implementation of the XUM1541 interface and it comes with an optional IEE488 plug! We can attach the 8050 to that, and use the OpenCBM tools to read and write data to and from the floppies. XUM1541: http://root.org/~nate/c64/xum1541/ ZoomFloppy: https://github.com/go4retro/ZoomFloppy OpenCBM: https://github.com/OpenCBM/OpenCBM 1541 only XUM1541: https://github.com/tebl/C64-XUM1541/ Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/225d14b1-a27e-40a3-bb07-abbaa99690b6/4425e117-abc7-45a2-92b1-106f9c0f896a-master.m3u8https://peertube.v1.root42.de/videos/embed/5f7F8BtKEo7RD5o7SSMYQf1864002026-08-04T08:37:24.196ZYESroot42NOhttps://peertube.v1.root42.de/w/rPW1fdKZvAhPTg9CNssxE4https://peertube.v1.root42.de/lazy-static/thumbnails/3c90fde8-8dc8-4dc0-ba47-a4dc264682b7.jpgUpgrading the PET 3016 to 32KB RAMA couple of years ago I got a PET 3016 from 1979. The machine comes stock with 16KB of RAM and back then we upgraded it using a RAM/ROM expansion, giving it 32KB of SRAM and BASIC V4 ROMs. However it never ran stable in this configuration. It turns out the SRAM was not playing nice with the system. So in this video we will use new old stock 8116 DRAM chips to upgrade the mainboard to its maximum and hopefully get a stable system. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/d125b479-626c-4053-8c8f-068978af4c6b/baf80fe0-ac9a-4bcf-9bec-c355ddd11a08-master.m3u8https://peertube.v1.root42.de/videos/embed/rPW1fdKZvAhPTg9CNssxE42458002026-08-04T08:41:17.008ZYESroot42NOhttps://peertube.v1.root42.de/w/aj6zQQ7tKYXxxbENzvhqvShttps://peertube.v1.root42.de/lazy-static/thumbnails/82e71e8b-af7d-4590-a2c8-7cbcf2896ef0.jpgLet's Code MS DOS 0x25: Cozy BASIC ChristmasAs is tradition for the Holiday Season on this channel, we will code a little Christmas themed thing in PowerBasic for MS DOS. Grab your copy of PB 3.20 and follow along as we learn how to load a 256 color PCX image and place a nice, cozy fire in there! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source Code: https://codeberg.org/root42/xmas2023https://peertube.v1.root42.de/static/streaming-playlists/hls/4b6913a5-60cd-4ab5-91e0-8def76d73b94/332e7109-1286-4c4b-8df5-57817acaab86-master.m3u8https://peertube.v1.root42.de/videos/embed/aj6zQQ7tKYXxxbENzvhqvS2242002026-08-04T08:43:18.780ZYESroot42NOhttps://peertube.v1.root42.de/w/5co5xCbKDsnoFMdaVjDxGVhttps://peertube.v1.root42.de/lazy-static/thumbnails/7aed5688-e4e8-4d6d-bab7-8529fc916e7a.jpgOriginal GameBoy IPS ModA friend gave me two GameBoys, one of which he wanted back after the repair. The other one was dead and I could keep it. So after a quick testing I determined that only the display board was broken due to quite severe battery damage. While maybe salvageable I decided to use a drop in IPS LCD replacement board, as the original DMG screen is pretty abysmal anyway. This mod is relatively easy to install, and requires no soldering! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 IPS Display Mod (DE): https://retroreiz.de/shop/werkstatt/ersatzteile-gameboy-classic/2-45-osd-tft-drop-in-dmg-lcd-backlight-mod-kit-fuer-gameboy-classic-original-groesse-no-ips/https://peertube.v1.root42.de/static/streaming-playlists/hls/21fb57a6-a555-4b70-8f77-46c5534026e9/7a4d0319-c7f3-48cf-9b5d-cf3e8955ad2e-master.m3u8https://peertube.v1.root42.de/videos/embed/5co5xCbKDsnoFMdaVjDxGV1770002026-08-04T08:46:20.178ZYESroot42NOhttps://peertube.v1.root42.de/w/4zUm9xUKSxw3jyue5epmjDhttps://peertube.v1.root42.de/lazy-static/thumbnails/f449591b-b932-490c-b6a9-b6c2ed7fcb17.jpgThe PicoGUS 2.0Ian Scott, also known as polpo, has upgraded his Raspberry Pico based Gravis Ultrasound clone to version 2.0. It can now be fully factory assembled, and has WaveBlaster support as well as a new design. Let’s test drive the card and see what it can do! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/1d073879-67a0-4b3a-84ab-23c8116a5831/93ba0c5f-7122-4077-ad5f-f827250ad261-master.m3u8https://peertube.v1.root42.de/videos/embed/4zUm9xUKSxw3jyue5epmjD2163002026-08-04T08:49:35.597ZYESroot42NOhttps://peertube.v1.root42.de/w/f8qY6udpPa5pWyj6fHf3eqhttps://peertube.v1.root42.de/lazy-static/thumbnails/30d26b32-52c9-4a98-a2bb-c79f94734de2.jpgOriginal GameBoy: IPS Mod Horizontal LinesThe IPS display mod for the original GameBoy from a couple of weeks ago already developed a fault. bright horizontal lines run through the display, and it seems a full replacement of the LCD panel is needed. It seems these mods are a bit fragile. Also the display lens is a bit crooked and needs fixing. So off to another round of DMG modding! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/726988c0-2021-421f-85ac-5be878731612/46bc3fe0-81f8-4f0a-ba99-0f4a19ad4368-master.m3u8https://peertube.v1.root42.de/videos/embed/f8qY6udpPa5pWyj6fHf3eq1409002026-08-04T08:51:49.143ZYESroot42NOhttps://peertube.v1.root42.de/w/rYjP8Va4KYMec3qeRoSXXehttps://peertube.v1.root42.de/lazy-static/thumbnails/f72c6bc1-22a9-447c-aff2-d7b8af9679e2.jpgLet's Code MS DOS 0x26: AdLib Drum MachineProgramming the OPL2 FM chip on the original AdLib card can be a bit tedious. Join me in this episode to learn how to program the drums on the AdLib card to create a simple sequencer or drum machine. In the future we will also look at the melodic instruments, but for now we try to create some nice percussion! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source code: https://codeberg.org/root42/dosadlib AdLib Programming Manual: https://www.vgmpf.com/Wiki/images/4/48/AdLib_-_Programming_Guide.pdf https://peertube.v1.root42.de/static/streaming-playlists/hls/d251b61b-7be4-42dd-90fe-c9992835474f/d60c01b4-a9cf-443f-8fba-f468d66bdd94-master.m3u8https://peertube.v1.root42.de/videos/embed/rYjP8Va4KYMec3qeRoSXXe2705002026-08-04T08:54:30.797ZYESroot42NOhttps://peertube.v1.root42.de/w/draET1peBdmXV2zXHk2Pnmhttps://peertube.v1.root42.de/lazy-static/thumbnails/8f780b41-5186-48d8-9ddc-51f055281bf7.jpgLet's Code MS DOS 0x27: AdLib OPL2 Melodic ProgrammingWe continue our quest to learn the secrets of the AdLib sound card and its Yamaha OPL2 FM synthesizer. Last time we did the drum programming, but this time we learn how to code melodic instruments and how to play notes. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source code: https://codeberg.org/root42/dosadlib/src/branch/melodic AdLib Programming Manual: https://www.vgmpf.com/Wiki/images/4/48/AdLib_-_Programming_Guide.pdf https://peertube.v1.root42.de/static/streaming-playlists/hls/64b137bc-dc97-44ee-af9b-65316153a8aa/97031597-2c48-4809-bdbb-6a92fdaa2335-master.m3u8https://peertube.v1.root42.de/videos/embed/draET1peBdmXV2zXHk2Pnm2606002026-08-04T08:57:12.022ZYESroot42NOhttps://peertube.v1.root42.de/w/rs7VuJ9wTiVL1QRqVsMiCihttps://peertube.v1.root42.de/lazy-static/thumbnails/bde33d69-fe1f-44fc-804a-f90228de39f7.jpgLow-Noise 78xx RegulatorsLinear voltage regulators such as the 7805 and 7812 are ubiquitous in vintage electronic equipment, and especially in home computers of the late 1970s and early 1980s. They have many advantages are very reliable. Their biggest drawback is their heat dissipation. The variants in metal TO3 packages are only available used or as new old stock. So if you want to replace them with a cooler running variant these brand new drop in replacements based on modern switching regulators might be worth a try. These particular variants have extremely low switching noise, so should be very usable in devices such as the Commodore 1541 floppy drive. So we will repair one of my broken 1541s and also fit it with the modern DR340 voltage regulator! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Original thread on DOSReloaded (German): https://dosreloaded.de/forum/thread/7306-sammelbestellung-dr340-drop-in-positive-switching-regulator-to-3-lm340-lm323-lm7/?postID=252620&highlight=schaltregler#post252620 https://peertube.v1.root42.de/static/streaming-playlists/hls/ce1a1210-230f-40b4-8f8c-b32420e4dee5/a25f4c4f-d6ab-4b22-a7d3-e47d8e3c1da3-master.m3u8https://peertube.v1.root42.de/videos/embed/rs7VuJ9wTiVL1QRqVsMiCi2514002026-08-04T09:01:15.518Zc64commodoreretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/4HRKwNbySkZh9FBHppheyChttps://peertube.v1.root42.de/lazy-static/thumbnails/f3eae898-235a-4f37-8b02-37f4e90177a3.jpgLet's Code MS DOS 0x28: Expanded Memory (EMS)The original IBM PC and MS DOS could — for the most part — only access 640KB of memory. The LIM EMS standard was at first a standard for RAM expansion cards to overcome this limit. On later machines like the 286 and 386 there was either support built into the chipsets or EMS memory was emulated via drivers like EMM386. Today we learn how to utilize EMS memory to play back an animation that is too large for conventional memory. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source Code: https://codeberg.org/root42/DOSEMS https://peertube.v1.root42.de/static/streaming-playlists/hls/1e239206-1ea1-4c37-87d8-229f34981148/4806dfc3-ac3e-406a-a429-d9ddbe36679e-master.m3u8https://peertube.v1.root42.de/videos/embed/4HRKwNbySkZh9FBHppheyC3179002026-08-04T09:04:26.021ZYESroot42NOhttps://peertube.v1.root42.de/w/2vseBnCPcZdMxB4c91Uz5Lhttps://peertube.v1.root42.de/lazy-static/thumbnails/2b85a0a9-1ec9-4bbc-8357-674caf2a41b0.jpgLazarustorm-PiStorm vs ACA500PlusThe original Amiga 500 is a great machine, but its 7MHz CPU is a bit slow at times and the 512K of base memory quite limited. We take a look at two accelerator cards that increase the CPU speed significantly and also bring a large amount of extra memory to the table. All the while these cards don’t require you to open up your A500, but instead they fit on the expansion slot on the left side of the Amiga, making the process very easy and reversible. Let’s take a look at the PiStorm based Lazarustorm and the Individual Computers’ ACA500plus. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Lazarustorm: https://github.com/arananet/LAZARUSTORM PiStorm: https://github.com/captain-amygdala/pistorm/wiki/FAQs ACA500plus: https://icomp.de/shop-icomp/de/shop/product/ACA500plus.html 0:00 Introduction & Explanation 15:13 ACA500plus Setup 20:06 ACA500plus Benchmark 24:25 ACA500plus Stealth Mode 26:16 Kickstart 3.1 Issues 31:18 Lazarustorm Benchmark 37:30 Comparison and Closing Wordshttps://peertube.v1.root42.de/static/streaming-playlists/hls/0c35e02b-deb4-45cc-ac24-07c5242f8118/5e88e5be-0042-46db-b735-36b45d962009-master.m3u8https://peertube.v1.root42.de/videos/embed/2vseBnCPcZdMxB4c91Uz5L2524002026-08-04T09:08:33.614ZYESroot42NOhttps://peertube.v1.root42.de/w/gvaNa2ASBtD8R3TQKT9zbchttps://peertube.v1.root42.de/lazy-static/thumbnails/5352718c-ce9f-48a5-af10-8496699b3b24.jpgPSU Battle: Commodore vs. ElectrowareThe original power supplies of our Commodore home computers are now at least 30 years old. Many need maintenance, some got lost or are defective. There are modern replacements. But are those any good? Are they better or worse than the old supplies? In this video we will compare my original Amiga 500 supply to a modern Mean Well based PSU by Electroware. We will mostly compare the ripple that both PSUs produce, which is one of the main factors that could disrupt the functionality of a computer. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Electroware PSUs: https://www.c64psu.com EEVBlog Oscilloscope Probes: https://www.youtube.com/watch?v=rzo4Ntxqu1E https://peertube.v1.root42.de/static/streaming-playlists/hls/7d8bafa4-1fdf-4dba-9dce-541a1b4e14c3/3ef000e6-4abd-4b2b-b78d-400c94f124b8-master.m3u8https://peertube.v1.root42.de/videos/embed/gvaNa2ASBtD8R3TQKT9zbc1397002026-08-04T09:10:20.611ZYESroot42NOhttps://peertube.v1.root42.de/w/uua1ZhbWF3ruQjrszL27Wdhttps://peertube.v1.root42.de/lazy-static/thumbnails/f65742cb-5b2a-4758-b6ee-ffbb8dc46cdd.jpgZombie Floppy: How To Revive A Broken 1541 HeadThe Commodore 1541 floppy drive is a real workhorse, that was used by millions of C64 users. It came with drive mechanisms from different vendors. The Newtronics/Mitsumi drive assembly has the annoying fault to have their drive heads fail due to some wires going open inside of the read/write head. This is so far not economically repairable. However a clever user by the nickname of Ruuudi on German Forum64 has designed a little bodge PCB to make the half of the head that is still okay to all the work and thus revive an otherwise dead drive. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Original thread on Forum64: https://www.forum64.de/index.php?thread/97685-reine-kopfsache-1541-ii-mitsumi-d500-kopfdefekt/&postID=2120659#post2120659 Thread about bodge: https://www.forum64.de/index.php?thread/146326-auferstehung-oder-2-lebens-kopf-hälfte-für-mitsumi-d500-knebel-1541/ https://peertube.v1.root42.de/static/streaming-playlists/hls/e6ae43d5-bbf8-44fd-a001-e3696d9090a8/ca1469f9-8589-4a38-81f0-c3580bf9de47-master.m3u8https://peertube.v1.root42.de/videos/embed/uua1ZhbWF3ruQjrszL27Wd1670002026-08-04T09:12:56.673ZYESroot42NOhttps://peertube.v1.root42.de/w/xn1fqo7zzFc7kSA12uYLMYhttps://peertube.v1.root42.de/lazy-static/thumbnails/13378afc-821e-4c2c-8831-2691fce324b1.jpgBlack Amiga 500Many a computer from the 1980s is today yellowed and brittle. The plastics age considerably over the decades. You can do some mitigation by retrobrighting with hydrogen peroxide. However for some machines you can even get replacement cases, and in some cases even brand new key caps for the keyboard. Today we will transform a beige Commodore A500 into a black beauty! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 New A500 cases and keycaps: https://www.a1200.net https://peertube.v1.root42.de/static/streaming-playlists/hls/fdfa1223-52f2-422b-aa38-19b6184b2dba/b486705b-d707-4533-82ce-1c637b106f5f-master.m3u8https://peertube.v1.root42.de/videos/embed/xn1fqo7zzFc7kSA12uYLMY2163002026-08-04T09:16:23.869ZYESroot42NOhttps://peertube.v1.root42.de/w/ieePVr1ZTEucDvFeY7q3knhttps://peertube.v1.root42.de/lazy-static/thumbnails/440041a8-c734-4961-a7c3-7a8875b5cfff.jpgCommodore PET: 40K RAM with SoftROMThe Commodore PET was one of the first true PCs. The entry model PET 2001 in 1977 came with 8K of RAM. My own PET 3016 from 1979 came with 16K, which I upgraded a while ago to 32K of RAM. This lets us run a lot of software, even interactive fiction games, for example Planetfall and Zork by Infocom. However we can do better! Using the SoftROM expansion we can add an additional 8K of SRAM to our system, that can be used by the Infocom interpreter, or any other software that knows about it and is changed accordingly. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 SoftROM project: https://petsd.net/softrom.php (German) RAM/ROM Expansion: https://retro-bobbel.de/x1541_de_2024/petram.html SD2PET: https://www.tfw8b.com/product/sd2pet-commodore-pet/ https://peertube.v1.root42.de/static/streaming-playlists/hls/8b848c04-a0f1-4633-8170-08778276118b/4df3b11f-7145-424d-817d-cb35567213c3-master.m3u8https://peertube.v1.root42.de/videos/embed/ieePVr1ZTEucDvFeY7q3kn2062002026-08-04T09:19:20.885ZYESroot42NOhttps://peertube.v1.root42.de/w/mpBEgDS3NiiVoALRJCh3Cahttps://peertube.v1.root42.de/lazy-static/thumbnails/f096561b-2784-4525-86ab-d96ea9dcc3d3.jpgLet's Code MS DOS 0x29: Extended Memory (XMS)In the previous episode we learned how to use Expanded Memory even down to the original IBM PC. From the IBM AT and other 286 machines onwards we can use Extended Memory instead. It doesn't require any additional hardware and allows you to use more than 640K of memory in real mode MS DOS programs. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source Code: https://codeberg.org/root42/dosxmshttps://peertube.v1.root42.de/static/streaming-playlists/hls/a542db26-9ea4-4a6d-80bd-093b48df51b9/555a3959-0df4-4056-8b63-0144ff324652-master.m3u8https://peertube.v1.root42.de/videos/embed/mpBEgDS3NiiVoALRJCh3Ca3258002026-08-04T09:22:40.916ZletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/nyZKXDRjhJ8wiquMPCxRuyhttps://peertube.v1.root42.de/lazy-static/thumbnails/a4e735d9-7a4b-489e-b4f2-1b6d1815dc42.jpgLet's Code MS DOS 0x2A: Background Adlib MusicWe already learned how to program the Adlib sound card to produce percussion and melodic instruments. Now we tackle the problem of getting real music out of it. By utilizing the Reality Adlib Tracker's playback routine we learn how to program the Programmable Interrupt Timer (PIT) in the PC to get a steady playback of background music. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source Code: https://codeberg.org/root42/radplayc https://peertube.v1.root42.de/static/streaming-playlists/hls/aeab4e9d-1613-4434-ae95-ceb2d9248514/c260e3f0-7992-4ccc-bd5c-842ac7447f91-master.m3u8https://peertube.v1.root42.de/videos/embed/nyZKXDRjhJ8wiquMPCxRuy2629002026-08-04T09:25:22.987ZYESroot42NOhttps://peertube.v1.root42.de/w/fkxdkw9eLEXQZuyicUg7Rnhttps://peertube.v1.root42.de/lazy-static/thumbnails/a7d301a3-6d90-449b-997e-5e0ad18c9e11.jpgLet's Code MS DOS 0x2B: Memory and PointersHere is a little refresher on how memory management and pointers work in the C programming language, and especially under real mode MS DOS programs written in Turbo C 2.0. We will go back to the basics to give all the new subscribers of this video series a chance to catch up. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/741a4ef1-eeca-4fbd-8f52-a1deac678fbf/f1900aa9-d9b5-4e6f-be73-d283db314bf2-master.m3u8https://peertube.v1.root42.de/videos/embed/fkxdkw9eLEXQZuyicUg7Rn1903002026-08-04T09:27:14.788ZletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/wFJwRURxw1vxP2D1pe5ciJhttps://peertube.v1.root42.de/lazy-static/thumbnails/cf2e6e41-5069-43d6-9cfd-c8f4d1c004cc.jpgWhat if the Amiga sounded betterBack in 1985 when the Amiga came out the Paula sound chip was not totally groundbreaking, but better than most of its competitors. It supported four channel stereo PCM playback. This could be used with sampled instruments to get a relatively natural sound. However there were many limitations, many of which due to the software not utilising the Paula to its fullest. Two years later, when the A500 came out, Roland released the MT-32. A consumer grade synthesizer module that was used relatively widely in the MS DOS gaming world, spearheaded by Sierra On-Line. It is a little known fact that you can use the MT-32 also on the Amiga with Sierra adventures such as King's Quest, Space Quest or Larry. Does the Amiga sound better with the MT-32? Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/f87e60ce-b6c7-4f83-af64-7b254ff027e0/75f8bb8f-a19d-4303-96f6-d8235cbf0635-master.m3u8https://peertube.v1.root42.de/videos/embed/wFJwRURxw1vxP2D1pe5ciJ1659522026-08-04T09:29:58.007ZamigacommodoremidiretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/9pkHp2XmN2kMwVFKM5MSGFhttps://peertube.v1.root42.de/lazy-static/thumbnails/3473aa27-e006-4632-9f02-1527af301361.jpgLet's Code MS DOS: 0x2C Noisy 3D AnimationEarlier this year I saw a demo effect using a random noise background and simple wireframe 3D using XOR line drawing to create an interesting visual effect. Building on the 3D Cube program we did a while ago we can reimplement this effect. The magic happens when you pause the animation -- or this video. Then the object magically disappears... Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source Code: https://codeberg.org/root42/dosxor3d https://peertube.v1.root42.de/static/streaming-playlists/hls/440b5d71-b214-44f9-a9f4-e334a3e2d7e7/39b9d0b2-b225-462d-bb2f-0a382e4d8330-master.m3u8https://peertube.v1.root42.de/videos/embed/9pkHp2XmN2kMwVFKM5MSGF1308002026-08-04T09:31:20.164ZdemosceneletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/o7LuFustuA1ktuyinq5fkVhttps://peertube.v1.root42.de/lazy-static/thumbnails/88c12778-6840-42f3-919f-5e8a356029c8.jpgNew Atari 2600 Homebrew Games (Raffle is closed!)Update: Livestream on YouTube on 22nd Nov 2024 19:00 CET / 18:00 UTC for the prize draw: https://youtube.com/live/G-IMbEYO-gs?feature=share The Atari VCS or 2600 is almost half a century old, but very much still alive and kicking! Let's have a look at five great homebrew games from the best couple of years. And one of those games I will give away! So stay until the end of the video on how to take part. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Champ Games: https://champ.games Audacity Games: https://adgm.us/portal/index.html https://peertube.v1.root42.de/static/streaming-playlists/hls/b31aef10-aed8-4061-8568-d3be29ab24fb/897451e4-abd9-4070-8a38-444563678995-master.m3u8https://peertube.v1.root42.de/videos/embed/o7LuFustuA1ktuyinq5fkV1169002026-08-04T09:33:06.647Zatari2600homebrewgamesretrogamingYESroot42NOhttps://peertube.v1.root42.de/w/kgCgEFFjnVpAv4jEc5RJTihttps://peertube.v1.root42.de/lazy-static/thumbnails/8ef7b8aa-0da6-407e-adb6-738c47e26ec1.jpgPokemon Red RestorationA very dirty and beat up Pokemon Red cartridge is on my desk today. So let's clean it up and make it shiny! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/9c0c24b2-4a95-4843-bfbf-b4dbf35b46cf/970cc015-f6dd-46f5-9896-aedf2241ce65-master.m3u8https://peertube.v1.root42.de/videos/embed/kgCgEFFjnVpAv4jEc5RJTi873012026-08-04T09:34:25.034ZgameboynintendopokemonretrogamingYESroot42NOhttps://peertube.v1.root42.de/w/iiABbEBiCeoqtcWpJKQzo7https://peertube.v1.root42.de/lazy-static/thumbnails/4918638f-28eb-4bbe-8beb-399b3edd6c36.jpgLet's Code MS DOS 0x2D: L-System XMasIt is the holiday season again, and what better way to celebrate than with MS DOS, PowerBasic and some nice L-systems! This time we introduce the push and pop functions and use them to draw colorful Christmas trees! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source code: https://codeberg.org/root42/L-XMAShttps://peertube.v1.root42.de/static/streaming-playlists/hls/8c205411-c9a7-45e3-b8a4-ea3328f68bd6/d24ea38c-9421-408c-84e0-d429c52fb107-master.m3u8https://peertube.v1.root42.de/videos/embed/iiABbEBiCeoqtcWpJKQzo71466002026-08-04T09:35:59.289ZcodingletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/vDsRKDFKMGhyP26jER9h99https://peertube.v1.root42.de/lazy-static/thumbnails/0c445c6f-7b01-4a31-a800-16a3aa55bfe4.jpgLet's Code MS DOS 0x2E: VGA Redefinable CharsetsThe EGA and VGA cards support custom or redefinable character sets. Those can be used to add characters from languages not covered by the original ROMs on the card, but can also be used to aid in drawing shapes in text mode. We will use this feature to port our VGA plasma effect from graphics to text mode. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source code: https://codeberg.org/root42/txtplasmhttps://peertube.v1.root42.de/static/streaming-playlists/hls/f01417a3-869c-43dc-9303-3bfcf1faa728/55366074-805c-404d-bda0-96ea457c1bdf-master.m3u8https://peertube.v1.root42.de/videos/embed/vDsRKDFKMGhyP26jER9h993174002026-08-04T09:39:33.209ZletscodemsdosYESroot42NOhttps://peertube.v1.root42.de/w/du8Qdco939t9rNNARZMaLBhttps://peertube.v1.root42.de/lazy-static/thumbnails/9ae0e661-aa52-48b0-abce-6a1e1f05a1fe.jpgSinclair ZX81: AV mod and New KeyboardI have acquired a Sinclair ZX81 from 1981. It is a Z80 based machine with e measly 1KiB of RAM, and arguably the worst keyboard ever. It has only RF video out, so you need a very old TV for that. We will do a composite A/V mod to have more and better options of video output, and it will require a new membrane keyboard, as those usually fail after all these decades. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Join me on Mastodon: https://chaos.social/@root42https://peertube.v1.root42.de/static/streaming-playlists/hls/651b50cd-7e12-4d5a-a56b-eecc5470ed17/77846044-1698-4df3-b454-ba07410bff3c-master.m3u8https://peertube.v1.root42.de/videos/embed/du8Qdco939t9rNNARZMaLB1669002026-08-04T09:42:06.328Zretrocomputingsinclairzx81YESroot42NOhttps://peertube.v1.root42.de/w/bnab7Nt2q6KzXMeYDBzwzVhttps://peertube.v1.root42.de/lazy-static/thumbnails/cb496b9f-1773-4ce2-9f9c-372da985de0c.jpgC64C Repair: Shimmering ColorI received a hand full of broken C64 machines, and am now trying to repair one machine at a time. This machine here seems to have multiple issues, but is working mostly. The color on the screen is shimmering a lot though. This might be a color RAM or PLA issue. Let's investigate! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Join me on Mastodon: https://chaos.social/@root42https://peertube.v1.root42.de/static/streaming-playlists/hls/53efa8e3-3126-409b-a8d2-4a551c31afdf/6d2e4876-0292-421e-8f15-a9036b3d699f-master.m3u8https://peertube.v1.root42.de/videos/embed/bnab7Nt2q6KzXMeYDBzwzV2521002026-08-04T09:46:02.406Zc64commodoreretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/5KtFMmfH7ozqujKE7TFhgDhttps://peertube.v1.root42.de/lazy-static/thumbnails/6d8f3d32-8bed-4a70-93ad-1742e1aaa9db.jpgC1531 Datassette RefurbThe Commodore Datassette is a very classic and iconic piece of equipment. It had a couple of variants. Today we have a black C1531 for the Commodore 264 range of computers: C116, C16 and Plus/4. It has some mechanical issues that we will try to fix. Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Join me on Mastodon: https://chaos.social/@root42 https://peertube.v1.root42.de/static/streaming-playlists/hls/2676994a-3700-4b8e-8b3d-fd7d1d8790d3/a2d30d93-bfae-4d16-a417-f51298971b97-master.m3u8https://peertube.v1.root42.de/videos/embed/5KtFMmfH7ozqujKE7TFhgD1138012026-08-04T09:47:26.922Zc64commodoredatassetteretrocomputingretrogamingYESroot42NOhttps://peertube.v1.root42.de/w/6TawnCq9UEjZtdfPx8wME3https://peertube.v1.root42.de/lazy-static/thumbnails/863c68b9-3766-4651-9f62-8a30fd6ea36f.jpgC64 Repair: Blue ScreenAnother C64 was waiting for a repair. This one had a blue screen on startup, but nothing else. Seems like a good sign, at least a bit of code seems to be executing. But boy, this was not a straightforward repair. I think someone messed with this board before, and left some loose ends. 64k RAM expansion: https://idoregesz.hu/product/commodore-c16-internal-ram-upgrade-to-64k/ Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/2fa27ea7-4fcc-48cd-b063-22722db3d932/3cb6289a-cde4-4bf2-a25f-d417d5f6ee0e-master.m3u8https://peertube.v1.root42.de/videos/embed/6TawnCq9UEjZtdfPx8wME32078002026-08-04T09:50:52.987Zc64commodoreretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/ko4UMJZz6qUZfuueHra2Mbhttps://peertube.v1.root42.de/lazy-static/thumbnails/4ccea8b6-92be-4749-b11e-efc5aef23f5c.jpgLet's Code Commodore PET 0x01: Hello World!This time around we will start another, probably short lived Let's Code series. It will center around the Commodore PET, the first personal computer made by Commodore in 1977. Even before the VIC20 and C64. It shares a lot of structural similarities, but also has many peculiarities. It does not have any proper graphics support, so we will do a bit of a fancy text based hello world program, using direct screen memory access. We will use the modern, optimizing C compiler named oscar64 Source Code: https://codeberg.org/root42/letscode-cbm-pet-hello-world Oscar64: https://github.com/drmortalwombat/oscar64 Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/9cf2683d-ea01-4064-86e7-127c137c4338/5218b04e-5a1f-4368-88cd-e0f156ce3188-master.m3u8https://peertube.v1.root42.de/videos/embed/ko4UMJZz6qUZfuueHra2Mb2025002026-08-04T09:52:39.799ZcommodorecommodorePETletscoderetrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/uYzFt7Mo921d1M23hcdZr7https://peertube.v1.root42.de/lazy-static/thumbnails/59eae87a-5c5d-4446-9024-ec36ed2be458.jpgC16 From Hell RepairThis is another dead Commodore machine from the pile of machines that eazy brought over at the beginning of the year. This time it is a TED machine: the venerable C16. It is completely dead, shows no signs of life. But this has never stopped us. Probably a dead CPU. How bad can it be, eh? 64k expansion: https://idoregesz.hu Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/eaa64a38-d57a-46fc-b461-f22183a27a44/7ea225b5-f51a-420d-acc2-7dadd0d96fd2-master.m3u8https://peertube.v1.root42.de/videos/embed/uYzFt7Mo921d1M23hcdZr72000002026-08-04T09:56:05.782ZYESroot42NOhttps://peertube.v1.root42.de/w/wBfbhTCFWv9t4mp3jzm7KVhttps://peertube.v1.root42.de/lazy-static/thumbnails/d7b681db-f7b5-40b1-aff5-a341a8a607b8.jpgLet's Code Commodore PET 0x02: Snakes on a PETIn this episode we code a simple game for the PET. It is the classic snake game, where you control a snake that picks up food and grows longer. We learn how to read from the keyboard, and how to limit the speed of the game, as the PET is slow, but not THAT slow. Source Code: https://codeberg.org/root42/letscode-cbm-pet-snake Oscar64: https://github.com/drmortalwombat/oscar64 Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/f7ddedcc-aabd-4976-9aea-5024b566743b/a18782df-dd87-4f36-b561-f0533e6a705a-master.m3u8https://peertube.v1.root42.de/videos/embed/wBfbhTCFWv9t4mp3jzm7KV3166502026-08-04T09:59:09.695ZcommodoreletscoderetrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/7dt6a9XNBhgXC4in81uKf7https://peertube.v1.root42.de/lazy-static/thumbnails/f6bbc24c-3cd8-4640-ade5-f724571bf87e.jpgFunny Playing 4.2 SEGA GameGear ModThis is another GameGear mod. But as my favorite LCD mod is currently not available, I ordered a random one off of Aliexpress. It turned out to be a Funny Playing branded one -- it seems it's their version 4.2, with laminated screen and glass lens. Funny enough (haha!) I can't see it on their website. No idea what that's about, but let's give this mod a go, anyway! Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: Into Space by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/3254738b-5a3d-4c2e-876e-38ce8c5200be/3d771d79-bb8d-4d2a-b7cc-bfb0d1d93f45-master.m3u8https://peertube.v1.root42.de/videos/embed/7dt6a9XNBhgXC4in81uKf72264002026-08-04T10:03:05.263ZgamegearmoddingretrogamingsegaYESroot42NOhttps://peertube.v1.root42.de/w/mkRKeLou72zvrUQ63vXLdbhttps://peertube.v1.root42.de/lazy-static/thumbnails/a842fcea-5298-4020-b158-610d9a03d2ac.jpgNew Homebrew OPL3 Sound Card: Sonic Buster 8It's been a long time since the last homebrew sound card we had on this channel! LABS is back with another iteration of the Blaster Board called the "Sonic Buster 8". One improvement is that it now uses a genuine OPL3 chip for the FM music. Furthermore it is all SMD components and hence very compact and will fit also in cases where space is an issue. But is it worth the money? How does it hold up against other homebrew sound cards? Sonic Buster 8: https://labs-lv.github.io/sb8/ Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join https://peertube.v1.root42.de/static/streaming-playlists/hls/a4bc8fc2-c4fc-40cb-99dc-29e46c35eada/9b211207-49bc-4255-a79e-f139aeac85b0-master.m3u8https://peertube.v1.root42.de/videos/embed/mkRKeLou72zvrUQ63vXLdb1840002026-08-04T10:05:31.510Zmsdosopl3retrocomputingsoundcardsYESroot42NOhttps://peertube.v1.root42.de/w/16CkJ3ryY2Uenc8g3HZ426https://peertube.v1.root42.de/lazy-static/thumbnails/7258b040-62a7-4d31-9796-361617a211b3.jpgNew SID Replacement: Kung Fu SID The MOS SID is the sound chip of the C64. Sadly they are no longer in production, and the ones that do exist start to fail. There are several replacement solutions out there, with varying pricepoints and sound quality. Now there is a new contender, fully open source hard- and software. It goes by the name of Kung Fu SID - promising great emulation and a price that's hard to beat. Does it deliver...? Kung Fu SID: https://github.com/Sgw32/KungFuSID ARMSID: https://www.nobomi.cz/8bit/armsid/index_en.php Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: Into Space by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/00c91d3d-add0-4836-b72f-245d9731d5a3/46e8dd4e-2f79-47ee-9e23-f8bde3707aa1-master.m3u8https://peertube.v1.root42.de/videos/embed/16CkJ3ryY2Uenc8g3HZ4261386522026-08-04T10:07:34.018Zc64commodoreretrocomputingretrogamingYESroot42NOhttps://peertube.v1.root42.de/w/e1w7dp9rUv678ALod2EhLMhttps://peertube.v1.root42.de/lazy-static/thumbnails/e1c52c94-07a8-4803-8c46-7257fc39670f.jpgFG-100 DDS Function GeneratorA function generator can be a great debugging tool for digital and analog circuits. There is a very cheap one floating around that's called the FG-100 DDS. What are its specs and is it any good?The FG-100 DDS Function Generator Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: Into Space by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/69595b54-a7ab-4f75-8cad-df144c0cae65/bbb9eada-db5d-43e6-86e7-989e38d664e0-master.m3u8https://peertube.v1.root42.de/videos/embed/e1w7dp9rUv678ALod2EhLM1414002026-08-04T10:09:11.748ZYESroot42NOhttps://peertube.v1.root42.de/w/vKWmFw14PpSnqrcrTsiF7Shttps://peertube.v1.root42.de/lazy-static/thumbnails/1d89c3ef-d0c8-4505-a86e-dc1de7545744.jpgPico DRAM TesterEric Schlaepfer aka TubeTime has released an open source tester for vintage DRAM ICs. It is based on the fabulous Raspberry Pi Pico 2 microcontroller. It supports even older chips that use -5V and +12V. I ordered PCBs and the components for building the tester, so let's warm up the soldering iron and build something! Github project page: https://github.com/schlae/pico-dram-tester/ Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: Conspire by moby (gratismoby.com) https://peertube.v1.root42.de/static/streaming-playlists/hls/f0fb806e-09da-4f23-9cd5-a5977e97edf2/0eb68f88-f46b-4a5a-a0ee-ec2f7a4fe964-master.m3u8https://peertube.v1.root42.de/videos/embed/vKWmFw14PpSnqrcrTsiF7S2856002026-08-04T10:13:12.658ZraspberrypiretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/vWL8G6mWJN1fxj3VfyBdKphttps://peertube.v1.root42.de/lazy-static/thumbnails/a76fb169-5f3c-4969-b0cb-6082c5d006e6.jpgLet's Code MS DOS 0x2F: Mandelbrot FractalEverybody knows the Mandelbrot set. It is one of the most famous fractals. And it is easy to code! At least if you don't care about speed... So let's try to code it for ancient MS DOS PCs with VGA cards! And there will be color cycling! Source: https://codeberg.org/root42/vgamandel Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: Into Space by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/f27e61e5-547a-49e2-9ea1-6650f5d55bfd/e9b138cb-baab-4587-813c-3ee61ddc6aa9-master.m3u8https://peertube.v1.root42.de/videos/embed/vWL8G6mWJN1fxj3VfyBdKp1480002026-08-04T10:14:33.132ZfractalsletscodemandelbrotmsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/wSxPeYyY4Xa28TuwFc4neBhttps://peertube.v1.root42.de/lazy-static/thumbnails/9f53db4d-ff46-4a9d-b8be-c340f0218bb4.jpgLet's Code MS DOS 0x30: VGA 3D TextmodeThe EGA and VGA card can do a lot of magic tricks in textmode. This time we will investigate how you can draw a rotating 3D cube overlayed on normal text by utilising the EGA/VGA feature of a second character set. Source: https://codeberg.org/root42/txtcube Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: Into Space by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/fa00f466-0089-4650-a605-13b55ecc8711/1e691f5e-c13a-4859-a85d-09bf1db32592-master.m3u8https://peertube.v1.root42.de/videos/embed/wSxPeYyY4Xa28TuwFc4neB3331002026-08-04T10:18:21.267ZdemosceneletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/f9YokohjmJYvgibFnCen7Hhttps://peertube.v1.root42.de/lazy-static/thumbnails/d1eebbdc-0fe1-4b5f-9d85-409def9a67d5.jpgNEW Low-Ripple 7805 - 7812 Drop-In RegulatorNot even two years ago I published a video about the DR323 / DR78xx switching regulator by Mr Floppy, which is a replacement for the linear LM323 and 78xx series of positive voltage regulators. Their main advantage was their extremely low ripple, compared to other solutions such as the ezSBC. Now Mr Floppy has developed v0.2 of the regulator, which has some small improvements, and removed the surface mount coaxial port for probing. Instead he developed the Checker Board, which can be used to do accurate probing of TO3 voltage regulators. Link to forum post: https://dosreloaded.de/forum/thread/7306-dr340-drop-in-positive-switching-regulator-to-3-lm340-lm323-lm78xx-ersatz/?postID=289753#post289753 Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/72a0a3d2-cf80-47ff-a57a-640abd81cda1/221d4faa-eaf8-4a16-aa8e-baba3d10fbd3-master.m3u8https://peertube.v1.root42.de/videos/embed/f9YokohjmJYvgibFnCen7H1456022026-08-04T10:20:17.543Z7805electricalengineeringlm323retrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/u4nJNNEBQPepdLU8NcJE2bhttps://peertube.v1.root42.de/lazy-static/thumbnails/6fa81d9a-fbee-411e-a6e8-e288c3d706a7.jpgLet's Code MS DOS 0x31: ANSI C Data TypesThe C programming language has only few builtin data types. But for a beginner those can be a bit confusing. So we will have a look at what data types are offered, and what kind of new datatypes you can build with C. Source Code: https://codeberg.org/root42/turboc-types Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/e33882a5-a114-45ae-900f-5ea6002b965c/7e51755b-79c0-4c32-9342-23856576f5d1-master.m3u8https://peertube.v1.root42.de/videos/embed/u4nJNNEBQPepdLU8NcJE2b1465002026-08-04T10:21:41.046ZletscodemsdosturbocYESroot42NOhttps://peertube.v1.root42.de/w/98DX1YmS3rEFysrPXZG6vzhttps://peertube.v1.root42.de/lazy-static/thumbnails/142f6ba5-7c56-454b-b22c-040344091a4f.jpgThe Horror: GameBoy Backlight ModThe original GameBoy (DMG) had not the best LCD display that one could wish for. Most importantly it was a reflective only display, which required substantial amounts of external light to be visible. A friend sent me their DMG with the request to install an LED backlight mod. I thought: how hard can it be? Well, you be the judge of it... Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/41dab3ca-2f9f-462c-a13d-474fb5d3eed7/689a2c08-a6c4-4d54-8bae-c59cae154c0d-master.m3u8https://peertube.v1.root42.de/videos/embed/98DX1YmS3rEFysrPXZG6vz2194002026-08-04T10:25:19.808ZgameboymoddingnintendoretrogamingYESroot42NOhttps://peertube.v1.root42.de/w/q3XnMUGNcnDcBxZ9wXWPULhttps://peertube.v1.root42.de/lazy-static/thumbnails/b438cd3f-7a2a-4af5-931e-779ab999a3a9.jpgDouble Trouble: C64 and 1541 RepairI have two dead Commodore devices here, that a user asked me to repair. A 1541 floppy disk drive and a bread bin C64. The drive's motor spins indefinitely and the LEDs don't come on. The C64 has a black screen. So let's get cracking, and repair both! With the C64 I made a couple of wrong turns, but in the end all turned out well! The 1541 had some other idea in store for me, and turned out to be a bit on the spiritual side... Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/c2c4f11e-de74-4324-941b-15660f968ab0/7c639aa1-40e8-4d1f-b2c6-ec14d1b216c2-master.m3u8https://peertube.v1.root42.de/videos/embed/q3XnMUGNcnDcBxZ9wXWPUL2960002026-08-04T10:29:32.861Z1541c64commodorefloppyretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/nFrKvAwLgDn7tbK5yfUtxjhttps://peertube.v1.root42.de/lazy-static/thumbnails/2c9c4e74-d6f4-4d4a-877f-ef60b7aaf2be.jpgCommodore 1541 Repair: Spin Me RoundWe have another dead 1541 floppy disk drive on the bench today. It is an infinitely spinning drive, so it means that somehow the drive is not booting. But what might be the cause...? Join me on Mastodon: https://chaos.social/@root42 Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/af91c9ba-6109-4934-af60-7abcf4e09964/1a6ecd08-3366-46e0-acda-381f2831f0b4-master.m3u8https://peertube.v1.root42.de/videos/embed/nFrKvAwLgDn7tbK5yfUtxj3216012026-08-04T10:34:05.061Zc64commodorefloppydisksretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/qdJkjcCgz75HrAmiK8kkNvhttps://peertube.v1.root42.de/lazy-static/thumbnails/df27b89d-4d79-4857-9b4f-ef89be29a65e.jpgCommodore SFD-1001 RepairAnother dead floppy drive has landed on my desk. I was told that "the motor isn't working". That can have different causes, but let's find out what the actual problem is. I never worked on one of these drives before, but they are related to the CBM 8050, a drive that I like very much. Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/c422577a-b013-46a1-9f06-5c0b2f6c1ebd/3917a764-0817-4c92-bfff-972470282c4a-master.m3u8https://peertube.v1.root42.de/videos/embed/qdJkjcCgz75HrAmiK8kkNv4145002026-08-04T10:40:10.308Zc64commodorefloppydrivesretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/8XsH2bF5TnPpGSi7NKsSMyhttps://peertube.v1.root42.de/lazy-static/thumbnails/b027f01c-f4cf-4ad3-9018-5ea40cd1fd81.jpgLet's Code MS DOS: 0x32 VGA Split Screen A couple of games back in the 1990s utilised the VGA split screen functionality to enable things that were otherwise only possible on more capable machines, like the Amiga. The VGA split screen allowed games such as Jazz Jackrabbit or Pinball Fantasies to display a static status bar at the bottom of the screen, while the rest of the screen was smoothly scrolling in two or more directions. In this video I will show how this is possible, and which VGA registers to program with the appropriate values. Source Code: https://codeberg.org/root42/vgasplit CRTC Documentation: http://www.osdever.net/FreeVGA/vga/crtcreg.htmhttps://peertube.v1.root42.de/static/streaming-playlists/hls/406e563e-db40-413f-aaa6-9083490935da/65a2c409-a154-44ef-ae13-c0137ff20d71-master.m3u8https://peertube.v1.root42.de/videos/embed/8XsH2bF5TnPpGSi7NKsSMy1934002026-08-04T10:41:54.461ZdemosceneletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/su24aZGofLefUhrsK2uqUMhttps://peertube.v1.root42.de/lazy-static/thumbnails/166e6666-a4b3-4acc-a4d7-6590bf017ed9.jpgCommodore 4040 Disk Drive RepairWe have another Commodore IEEE-488 dual disk drive. It is the predecessor of the 8050 and it is almost compatible with the 1541, the C64's disk drive. This specimen doesn't work, its drives look quite mangled. So let's fix it! But it is never that easy... Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/d67714a8-ac4a-4286-af80-f0aeb6a4b3a5/d8b10bee-6943-4098-9246-cca9ce1f131c-master.m3u8https://peertube.v1.root42.de/videos/embed/su24aZGofLefUhrsK2uqUM1697012026-08-04T10:44:18.569Zcbm4040commodorecommodorePETfloppydrivesretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/vYb1fkdcfK1cx7RHsLRheFhttps://peertube.v1.root42.de/lazy-static/thumbnails/ab4967b0-cf27-4cd8-ab68-a1d634b82a3b.jpgLet's Code MS DOS: 0x33 PowerBasic 3D StarfieldEvery year around Christmas we return to the roots. To PowerBasic instead of Turbo C! As Christmas is already over, we do something that is also befitting New Year's Eve: a classic 3D starfield! With some EGA/VGA palette tricks, to make the stars appear smoother! Source Code: https://codeberg.org/root42/pbstars Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/f2b0d66d-3853-4126-b6f4-2781166772c1/63bac105-7897-460b-b48a-e08c4a06885a-master.m3u8https://peertube.v1.root42.de/videos/embed/vYb1fkdcfK1cx7RHsLRheF1962002026-08-04T10:46:17.588ZdemosceneletscodemsdospowerbasicYESroot42NOhttps://peertube.v1.root42.de/w/q7QF8v6ejkAvn65SZ69iz5https://peertube.v1.root42.de/lazy-static/thumbnails/b0025a23-9b5b-479c-857a-2eb091911c29.jpgThe OneROM Versatile ROM EmulatorThe old home computers like the C64, PET and VIC20 use a lot of 24 pin ROM chips. Many of those are failing and are often replaced with EPROMs and adapter boards. Those are sometimes hard to acquire, especially for older machines such as the PET. But even more common EPROMs require a dedicated UV eraser, programmer like the Minipro, which all adds up. The OneROM is a versatile replacement for EPROMs based on the RP2350 MCU. It allows for easy reprogramming, multiple ROM images and can replace up to three ROM chips in a single system. Oh, and it's open source! Piers' channel: https://www.youtube.com/@piers_rocks Project page: https://onerom.org Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/c34fc98a-d699-4c4d-985d-b5269f996792/74884fee-6640-4ad7-baff-9a3d2127b5e2-master.m3u8https://peertube.v1.root42.de/videos/embed/q7QF8v6ejkAvn65SZ69iz51935002026-08-04T10:49:06.255Zc64commodoreepromretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/eXwh1XPdi1ixdC8p7iePUjhttps://peertube.v1.root42.de/lazy-static/thumbnails/d0e8310d-8a56-4530-8ef8-2d1d7f27e452.jpgLet's Code MS DOS 0x34: VGA BlendingThe VGA card can display up to 256 colors on the screen at the same time, using an indexed 8 bit color mode. This is not much, but it allows us to fade two 16 color images into each other. This looks pretty nifty! Source Code: https://codeberg.org/root42/VGABLEND Join me on Mastodon: https://chaos.social/@root42https://peertube.v1.root42.de/static/streaming-playlists/hls/71075e46-e1de-490d-88e4-c2058e7c028e/897fab4a-0a24-4049-adb7-0fa37b573d62-master.m3u8https://peertube.v1.root42.de/videos/embed/eXwh1XPdi1ixdC8p7iePUj1543012026-08-04T10:50:38.944ZdemosceneletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/8j9XmpB8GxsuBepe23jZSUhttps://peertube.v1.root42.de/lazy-static/thumbnails/af8744d3-e6d5-42cd-9e79-f2f756013fcb.jpgLet's Code MS DOS 0x35: Sprites & ScalingAdventure games like Monkey Island utilized sprites that could be moved and scaled arbitrarily on the screen. How does this work on a machine that doesn't have support hardware sprites? We will work our way from simple sprites with no transparency, to ones that are clipped, have transparency and can be scaled down arbitrarily. Source Code: https://codeberg.org/root42/VSPRITES Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/3b38e075-4428-4cc1-aee3-ad4212816cdc/c7f6f6b9-e6cd-4ff9-a791-fbb9ef8b340c-master.m3u8https://peertube.v1.root42.de/videos/embed/8j9XmpB8GxsuBepe23jZSU2721002026-08-04T10:54:25.016ZgameengineletscodemsdosretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/qTtXVoAkHJ2Fu256Pwtbechttps://peertube.v1.root42.de/lazy-static/thumbnails/31b801e9-ce5b-4277-a5a7-e8308be6bbcb.jpgLet's Code MS DOS 0x36: Sprites and OcclusionIn the last video we learned how to make 2D sprites with transparency and scaling. This time around we also make our Guybrush automatically scale with the background, limit his ability to move into nonsensical parts of the scene, and most important: Walk in front and behind objects. Source Code: https://codeberg.org/root42/VSPRITES/src/branch/feature/mask-and-scaling Join me on Mastodon: https://chaos.social/@root42https://peertube.v1.root42.de/static/streaming-playlists/hls/c98b7e5e-5e7a-4b22-bb76-6cface4d8f1d/899f5f92-9d9e-433e-9bd9-57c3ea64a0b4-master.m3u8https://peertube.v1.root42.de/videos/embed/qTtXVoAkHJ2Fu256Pwtbec1826002026-08-04T10:56:19.192ZletscodemsdospointandclickretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/nErtoepcnEPx4n8PDqEJAthttps://peertube.v1.root42.de/lazy-static/thumbnails/2827d9d9-7973-4198-a440-9cc0cb064a71.jpgFloppy Disk PunchFloppy Disk Punch Back in the 1980s floppy disks were expensive. And many early floppy disk drives were only single sided, which means they only had one read/write head and would only use one disk side. Both Commodore and Apple-II users quickly figured out that you could flip the disk around, if you punched a hole into the other side of the disk. This is a quick explanation on why this helped to double your disk capacity and some other differences between Commodore and IBM disk drives. Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/af6ddf74-bca4-42ec-970d-de31fbc79187/9fbc4715-eb03-4cd7-b3b5-45faa7681dde-master.m3u8https://peertube.v1.root42.de/videos/embed/nErtoepcnEPx4n8PDqEJAt687002026-08-04T10:57:16.274ZfloppydisksretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/v5ALiYR8q4ZiBiVsqgMiNwhttps://peertube.v1.root42.de/lazy-static/thumbnails/f4abedfc-a8c6-4d01-a248-42af21101549.jpgTND232 Tandy Serial Port SoundcardThe Tandy 1000 and IBM PC Jr utilized the cheap Texas Instriuments SN76489 programmable sound generator. While it never caught on as a sound standard outside of these machines, many DOS games from the 1980s still supported this chip. What if you wanted to listen to video game music using the original chip, no emulation, but you had only a serial or USB port? Well, now there is a solution for you! Project page: https://www.retroianer.de/index.php/tnd232-serielle-und-usb-sn76489-tandy-soundkarte/ Source: https://github.com/matze79/TND232 Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/eb7d6b97-1ee9-4b42-896f-66720860d7e6/71ba5c0d-7568-480e-9ae5-acb388e77b51-master.m3u8https://peertube.v1.root42.de/videos/embed/v5ALiYR8q4ZiBiVsqgMiNw1532002026-08-04T10:59:27.544ZmsdosretrocomputingsoundcardstandyYESroot42NOhttps://peertube.v1.root42.de/w/b53fVsrHGJYDJwQdeZFmnqhttps://peertube.v1.root42.de/lazy-static/thumbnails/7848a5c5-9fef-466a-9be9-fdab3ec5d64a.jpg1541 DifferencesThe 1541 was the ubiquitous floppy disk drive for the C64. The different drive revisions look very similar, but on the inside there are some significant differences. Not only did they use two different manufacturers for the mechanisms. But the mainboards also had multiple revisions, and one particularly snarky little difference in the 1541C, which was only used on some of the drives that could make swapping parts between old drives very difficult. Join me on Mastodon: https://chaos.social/@root42https://peertube.v1.root42.de/static/streaming-playlists/hls/518bc0b5-a897-4287-8a13-4fd3b7fde272/bfa6c866-80b6-4076-916e-c28421baff2f-master.m3u8https://peertube.v1.root42.de/videos/embed/b53fVsrHGJYDJwQdeZFmnq1312002026-08-04T11:01:32.343Zc1541c64floppydisksretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/rbiHRbvDRuFt5YJbeW1YSghttps://peertube.v1.root42.de/lazy-static/thumbnails/c9ef0a3b-a2cd-4d6e-9fa4-90f581722575.jpgLet's Code MS DOS: 0x37 Rainbow Surf AnalysisThis year's Revision demoparty had a surprising winner in the 256 byte compo. It was Rainbow Surf by Plex/BionFX and it is only 16 bytes long. That is short, very short. In fact, here is the code: c4 04 48 ab 26 03 45 ae 26 03 05 c1 e8 02 eb f2. Let's dissect it! Demozoo link: https://demozoo.org/productions/389794/ Life 256: https://youtu.be/noNhtyEKeb0?si=00Dr4S2qcV6inS3z Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006 https://peertube.v1.root42.de/static/streaming-playlists/hls/cbe4d352-266c-4512-b2c9-0c17b8364143/72a6efe2-4f73-4835-bb3d-f3b45cf44a17-master.m3u8https://peertube.v1.root42.de/videos/embed/rbiHRbvDRuFt5YJbeW1YSg1779002026-08-04T11:03:37.075ZdemosceneletscodemsdossizecodingYESroot42NOhttps://peertube.v1.root42.de/w/ihLBuboTL5KCHyeFfy9KuXhttps://peertube.v1.root42.de/lazy-static/thumbnails/1b7f06f9-9b16-43d0-b173-6be752894042.jpgIndividual Computers C64 Smart Supply The old C64 doorstop power supplies and their successors are a bit of a liability if you continue to use them nowadays. The internal voltage regulators like to die, and in the process they can destroy the C64 or worse. There are modern power supplies to replace them, but Individual Computers are now coming out with the "Commodore C64 Smart Supply", including official Commodore branding! And the sales pitch is that this is the best PSU you can get for your vintage C64. Let's take it for a test drive! iComp PSU analysis (in German): https://forum.icomp.de/index.php?thread/4411-was-macht-ein-gutes-c64-netzteil-aus/ Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/8c02c024-4b39-4983-a443-2208bb0f0bdb/24a7a038-9147-447d-b71c-37f993f6f870-master.m3u8https://peertube.v1.root42.de/videos/embed/ihLBuboTL5KCHyeFfy9KuX2530002026-08-04T11:07:33.684Zc64commodoreretrocomputingYESroot42NOhttps://peertube.v1.root42.de/w/kGtpp7LDjxvUaCVjfFxGdphttps://peertube.v1.root42.de/lazy-static/thumbnails/7a7addcd-7deb-41a9-b4af-d78a05df244a.jpgCommodore 4040 RefurbAnother Commodore 4040 dual floppy disk drive ended up in my hands, but only temporarily for repairs and refurbishing. This drive didn't boot up in the beginning and had other small issues. I will show in great detail how to take these things apart and how to clean them and get them up to speed again. Join me on Mastodon: https://chaos.social/@root42 https://peertube.v1.root42.de/static/streaming-playlists/hls/9f8445f6-f5f3-4ace-a808-1349a978da77/0fd60a17-b880-4063-bec6-f4bfb40568fb-master.m3u8https://peertube.v1.root42.de/videos/embed/kGtpp7LDjxvUaCVjfFxGdp2461002026-08-04T11:11:07.709ZYESroot42NOhttps://peertube.v1.root42.de/w/gkyrZhx7ZPcryk2q7CAUDyhttps://peertube.v1.root42.de/lazy-static/thumbnails/4ac4a076-e2df-4d50-ae55-536db05ee1de.jpgFPGATED for C16 and Plus4The Commodore 264 line of computers included the C116, C16 and Plus/4. They were build around the TED video and I/O chip. Also known as the MOS 7360 and MOS 8360, the early revisions of the chip were plagued with production issues. Many of the early R1 chips are broken by now. Replacements are hard to come by and often expensive. Now there is a modern replacement: The FPGATED by Istvan Hegedus offers high compatibility, together with additional features. HDMI output for modern screens, as well as ROM replacements and SID emulation in future firmware updates. Let's test it and see how compatible it is! FPGATED project: https://www.fpgated.hu Config utility: https://plus4world.powweb.com/software/FPGATED_Config_Program Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/7c343557-0a3f-4e40-82fb-6dee481044a2/94d8c42a-4b3d-4bd7-ba22-ae5ec5224bd1-master.m3u8https://peertube.v1.root42.de/videos/embed/gkyrZhx7ZPcryk2q7CAUDy1804002026-08-04T11:13:39.418Zcommodorefpgaplus4retocomputingYESroot42NOhttps://peertube.v1.root42.de/w/gkdPWq83sBuAy9smk6YfUPhttps://peertube.v1.root42.de/lazy-static/thumbnails/815db40a-856d-46e7-a321-f737c0487c9f.jpgLet's Code MS DOS 0x38: Huge Pointers in Turbo CIn MS DOS you can only access up to one Megabyte of memory easily, on an original PC or XT. This memory in turn is segmented, so accessing more than 64K at a time becomes a bit more tricky. This is why languages like Turbo C and Pascal introduced near and far pointers to the programmer. However there are also huge pointers, which we will investigate in this episode. Sourcecode: https://codeberg.org/root42/LARGEARR Join me on Mastodon: https://chaos.social/@root42 Music: A Little Wonder by Spino2006https://peertube.v1.root42.de/static/streaming-playlists/hls/7c281dbc-46bd-4f79-a5ac-fbbc25ec06df/e46031ea-49b3-40fa-8373-aa27f89a21d7-master.m3u8https://peertube.v1.root42.de/videos/embed/gkdPWq83sBuAy9smk6YfUP2205002026-08-04T11:15:49.281ZletscodemsdosretrocomputingturbocYESroot42NOhttps://peertube.v1.root42.de/c/root42/videoshttps://peertube.v1.root42.de/a/root42_videos/video-channels