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 basically duplicated the 6883 SAM application note, i.e. the same basic circuit as the Radio Shack Color Computer and the Dragon. 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.


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.

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