If you're into historic electronic design, from schematics to ULAs to timing to engineering notes, the YT channel Happy Little Diodes hit the jackpot in obtaining, scanning, and sharing Sinclair's Spectrum documents Video: www.youtube.com/watch?v=jiW3... Files: docs.google.com/spreadsheets...
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youtube.comThe Ferranti Files: 40 Years of Sinclair Secrets UnearthedYouTube video by Happy Little Diodes
With permission from the current IP holder, Sky in the UK, too, which is really cool. I'm pretty much stunned by this. It's a full deep dive into how a family of home computer systems, including their custom chips, were designed by hand by really clever people back in the day
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And if you like all that then you might also like online gate-level visualizations of various retro-computing chips ARM1 CPU: www.visual6502.org/sim/varm/arm... 6502 CPU: www.visual6502.org/JSSim/index.... 6800 CPU: www.visual6502.org/JSSim/expert... NES PPU: www.qmtpro.com/~nes/chipima...