The Cape Computer Club's been around for a while. In the early eighties, there were groups centered on the 680x, the Z-80, the 6502, and the computers available at the time : Apple, Sinclair, Commodore, TRS-80, Acorn Atom...
I hung out with the 680x group a bit -- they built a 6809 based computer on Eurocards, complete with dynamic RAM, a floppy disc controller, and graphics.
The 6809 Microsystem - Specifications by Jonathan Eva and Neil Walsh.
6809 Microsystem System Software Version 4, Release date 6 April 1984, Author J. A. Eva.
Just the schematics as JPGs: CPU, DRAM, CRT Controller pages 1, 2, and 3, Floppy Disk Controller, Serial Port, and Parallel Port. I have better (bigger) scans available if you need them, but I would say that these are for historical interest only (although I would like to get my hands on some of this hardware :-).
If you used to belong to the Cape Computer Club in the early eighties, drop me an email.
While still in high school, I played with Motorola D2 and D3 6800 processor boards, and somewhere along the way I fell in love with the 6809. The Cape Computer Club had a fairly active 680x group which designed and built a kickass 6809 system -- Graphics, Dynamic RAM, DAT (That's Dynamic Address Translation, not magtape), the works. At that stage I didn't have the budget to build a similar system, so I kept playing with the 6800 stuff.
A few years later I was a student and had access to design tools (well, smARTWORK, which is better than nothing) and I could easily get double sided (but not through-hole plated) PCBs made.
My first attempt was a close copy of the Sardis 6809 SBC (schematic) which is basically a Color Computer / Dragon minus the Video Display Generator. That board turned out to be unbuildable, due to the lack of though-hole plating, and the project got sidelined.
My second attempt was much simpler. I realised that I could get 64K of RAM using just two chips (32kx8 CMOS RAM), and by that time I had access to peecees that I could use for a terminal, so I didn't need a built-in video display.
Unfortunately I got a few things wrong, and I couldn't get the board to work. Read all about it if you want to.
The Microbox is a 6809 / 6883 (SAM) based design with 64K main RAM and 128K video RAM with a NEC 7220A graphic display controller. Quite a nifty design, even if the PCB is huge. My Microbox II.
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