The Cape Computer Club 680x Group System

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.

My 6809 Design of 1990

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.

My Microbox II

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.

Stuff

Note on Copyright: I'm making this information available because I think hobbyists like myself can benefit from it. I'm pretty sure nobody will lose money from this, and I'm not making any either. If you hold the copyright to something I have here, and you don't want me to make it available here, please contact me (webmaster @ this site) and I'll remove it.

General stuff

C3PO Archives

6809 stuff

C stuff

FLEX stuff

6800 stuff

Links

General links

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OS-9 links

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