Some Ideas for a Hardware Project, ...

I was thinking about Ben Eater's 6502 Breadboard Computer. It's quite expensive, because you need an EPROM programmer and a power supply and an LCD display so it all adds up to $200 or so. But I can get old Rockwell 6502 chips on eBay for about $15, and a couple of Raspberry Pi Pico2s and some SN74LVC245A logic level shifters for about the same price, so for $30 I could build "soft hardware" peripherals for a real 6502 CPU. This could interface the 6502 to RAM/ROM/Clock and I/O "software circuitry" through WEB USB and a web page, see Access USB Devices on the Web.

Then I would be able to build that modular 6502 computer that I drew circuit diagrams for when I was a kid, ... The advantage with this way of doing things is that I would be able run the CPU at low clock speeds and have a software digital logic analyser watching the pins and setting hardware debug breakpoints and what-not. See Single-Stepping The 6502 Processor. The trick is to design the thing so that the software is modular and lets you do things like build systems with multiple CPUs. It would also work for Z80-based systems.

Here's a much better idea, A Kit-of-No-Parts presented by Hannah Perner-Wilson in 2012: https://konp.plusea.at/

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