CuriousMarc on his First Computer, Jeff Geerling on His First Electronics Kit and Jeff Tranter on A 68000 SBC built from a 90s CS Undergraduate Text Book

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The design for this one is available from The Internet Archive. See Microprocessor systems design : 68000 hardware, software, and interfacing by Alan Clements. He cross-compiled Lee Davison's 68k Enhanced BASIC. See Building a 68000 Single Board Computer - Enhanced Basic. You can still get Lee's original and unmodified EhBASIC V3.52 source code from https://www.ist-schlau.de/downloads.html. His github is https://github.com/jefftranter.

 

See also Low Cost Logic Analyzers and Fixing Weird Retro Tech and now for an exercise, program a Pi Pico to extract the SC/MP ROM listing from the soundtrack of Marc's video. But do it by writing a Pi Pico assembler in Blockly. That will be useful for my project. See Some Ideas for a Hardware Project, ... and David's Bare Metal Adventures videos which have all the technical details of what you need to do.

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So what you turn out to be seems to depend a lot on how primitive your first computer was. See CuriousMarc Making The US$33,000 HP 3GHz Signal Generator he Bought for US$150 Work! and The Action Lab - Ulexite (How Does Television Stone Work?)

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