I was sure this kind of garbled screen was caused by a faulty CRT controller. It turns out, I was totally wrong! Along the way we take a good look at how video is generated in the Amstrad CPC and what some of the most common RAM failure patterns are. Support Noel's Retro Lab on Patreon: https://www.patreon.com/NoelsRetroLab Chapters: 00:00 Intro 01:07 First check 01:47 Power issues 04:38 Video generation 07:01 Gate Array 10:47 ROM 12:44 Charred surprise 14:07 Z80 15:12 RAM 18:47 Why? 22:38 Luminance and sync 26:24 Conclusion Links: Commented ROM disassembly https://cpctech.cpcwiki.de/docs/os.asm Amstrad Diagnostics ROM https://github.com/llopis/amstradcpc-rom-check Music tracks: Funky Stars by McKlain https://mcklain.bandcamp.com/track/funky-stars-amstrad-cpc-true-8bit-version Battro OST by McKlain https://mcklain.bandcamp.com/track/battro-ost More awesome music by McKlain: https://www.mcklain.com You can also support Noel's Retro Lab on YouTube by joining this channel: https://www.youtube.com/channel/UC2-SP1bYi3ueKlVU7I75wFw/join ? Tools I use ➤ https://noelsretrolab.com/tools.html Connect with Noel's Retro Lab: Discord ➤ https://discord.gg/ETcCh6J Facebook ➤ https://www.facebook.com/NoelsRetroLab Twitter ➤ https://twitter.com/NoelsRetroLab Instagram ➤ https://www.instagram.com/NoelsRetroLab Mailing list ➤ https://noelsretrolab.com #amstrad #retro #repair ... https://www.youtube.com/watch?v=BLzHPf1IY8c

This episode is sponsored by PCBWay https://www.pcbway.com Do you know what exactly OUT (C),A does? Are you sure? Prepare for a deep dive into the madness that is Z80 I/O and some sneaky ways to get around it. Support Noel's Retro Lab on Patreon: https://www.patreon.com/NoelsRetroLab You can also support Noel's Retro Lab on YouTube by joining this channel: https://www.youtube.com/channel/UC2-SP1bYi3ueKlVU7I75wFw/join ? Tools used in this video (affiliate links): Signal generator https://amzn.to/3O2DMMB Oscilloscope https://amzn.to/48OnYoB Power supply https://amzn.to/3RYPrNA Other tools I use https://noelsretrolab.com/tools.html Chapters: 00:00 Intro 00:26 Memory-mapped IO 01:38 Dedicated IO lines 02:53 OUT 05:28 Measuring 08:33 What about B? 13:08 Amstrad CPC 17:18 Alternative to OUT Connect with Noel's Retro Lab: Discord ➤ https://discord.gg/ETcCh6J Facebook ➤ https://www.facebook.com/NoelsRetroLab Twitter ➤ https://twitter.com/NoelsRetroLab Instagram ➤ https://www.instagram.com/NoelsRetroLab Mailing list ➤ https://noelsretrolab.com ... https://www.youtube.com/watch?v=aB9AuKx8kBU

Support Noel's Retro Lab on Patreon: https://www.patreon.com/NoelsRetroLab I troubleshoot and fix two MSX SVI 728 computers, both of which had internal cables held by hot glue from the factory! Is this one of the worst-built computers ever? One had a glitchy video out, and the other one worked fine but didn't have any color. Spectravideo 728 Service Manual: https://archive.org/details/MSXSVI728ServiceAndTechnicalManualVol.1 Order the SVI 728 power connector from here: opermatic@hotmail.es Connect with Noel's Retro Lab: Discord ➤ https://discord.gg/ETcCh6J Facebook ➤ https://www.facebook.com/NoelsRetroLab/ Instagram ➤ https://www.instagram.com/noel_retrolab/ Twitter ➤ https://twitter.com/noel_retrolab #svi #spectravideo ... https://www.youtube.com/watch?v=Klk_lX5AuYg

This episode is sponsored by PCBWay https://www.pcbway.com Today I'm taking a sad-looking Amiga 500 and restoring it into something much better looking and much more functional. I try both retrobrighting with sun (sunbrighting?) and with liquid hydrogen peroxide with different results. Finally, I swap out the internal floppy disk drive for a Gotek with an external OLED screen. Chapters: 00:00 Intro 00:48 First look 02:25 Opening it up 05:30 Cleaning and retrobright 09:33 Gotek 16:24 Sunbright results 18:07 Gotek mounting 22:21 Key results 23:10 Comparisons 24:42 Conclusion Support Noel's Retro Lab on Patreon: https://www.patreon.com/NoelsRetroLab You can also support Noel's Retro Lab on YouTube by joining this channel: https://www.youtube.com/channel/UC2-SP1bYi3ueKlVU7I75wFw/join Links: RetroRecipes on Subrighting https://www.youtube.com/watch?v=8P1OVj0IcqY In-depth video about Retrobright https://www.youtube.com/watch?v=YPl356YKcVs Gotek support model https://www.thingiverse.com/thing:2745049 Flashfloppy https://github.com/keirf/FlashFloppy Music tracks: Funky Stars by McKlain https://mcklain.bandcamp.com/track/funky-stars-amstrad-cpc-true-8bit-version Battro OST by McKlain https://mcklain.bandcamp.com/track/battro-ost More awesome music by McKlain: https://www.mcklain.com ? Tools I use ➤ https://noelsretrolab.com/tools.html Connect with Noel's Retro Lab: Discord ➤ https://discord.gg/ETcCh6J Facebook ➤ https://www.facebook.com/NoelsRetroLab Twitter ➤ https://twitter.com/NoelsRetroLab Instagram ➤ https://www.instagram.com/NoelsRetroLab Mailing list ➤ https://noelsretrolab.com ... https://www.youtube.com/watch?v=YLPuydUrDx8