Restoring classic kits we built way-back-when

From: Sellam Ismail <>
Date: Fri Oct 5 02:34:25 2001

On Thu, 4 Oct 2001, Michael Holley wrote:

> I build a replacement floppy disk controller card for SWTPC 6800 / 6809
> computers. The original controllers were build from around 1977 to 1984. The
> first goal was to make it software compatible. A secondary goal was to
> duplicate the technology of the early 1980s. After working on it for a few
> months I decided to use a programmable logic device from 1991. This reduced
> the cost and made the design much more flexible. I would have liked to use
> all 1980s technology but the newer CPLD made the design much better.
> The Xilinx XC9572 CPLD is based on the Plus Logic 2020. I have an
> engineering sample of the 2020 with a 9118 date code.
> I did put the date (July 2001) on the board.
> You can see the design here.

I got one of these boards and I must say it is professionally designed and
made. Fantastic work, Mike!

Sellam Ismail Vintage Computer Festival
International Man of Intrigue and Danger
Received on Fri Oct 05 2001 - 02:34:25 BST

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