SWTPC 6800 and Percom Floppy Controller

Mike Douglas deramp5113 at yahoo.com
Wed Jan 8 15:02:37 CST 2020


Thanks for the response. The article you reference is also the one bit of documentation I was able to find. It's been a big help. I have been in contact with Bob and recently picked up one of his RAM/EPROM boards to use while I get the system restored.

     On Wednesday, January 8, 2020, 2:29:32 PM CST, Gregory Beat <w9gb at icloud.com> wrote:  
 Mike -
Cer-Comp5566 Ricochet AvenueLas Vegas, NV 89110(702) 452-0632William E. Vergona wrote firmware on those two (2), 2708 ROMs.He later (1980s) worked with Tandy (Coco-3) Color Computer products.==‘68 Journal, May 1980 (Back to Future, 40 years later)MiniDisk+ DOS , Pages 11 - 13http://www.swtpcemu.com/swtpc/68MJArchive/V02N05_May1980.pdf
Have you contacted Bob Applegate (Corsham Tech)?https://www.corshamtech.com/ss-50-faqs/He might be aware of source from his SS-50 clients and contacts.
Bob reopened his business (Corsham) three weeks ago, for a period of time.I did not see him at VCF Midwest, due to his health issues.https://www.corshamtech.com/back-in-business-for-now/
GregChicago==From: Mike Douglas <deramp5113 at yahoo.com>
To: cctalk at classiccmp.org
Subject: SWTPC 6800 and Percom Floppy Controller

I?m restoring a SWTPC 6800 that includes the Percom LFD-400 floppy controller. This controller goes on the SS-50 bus instead of the SS-30 bus where the SWTPC controllers installed. The standard Percom MiniDOS PROM is installed, and the other two PROM sockets have a third party extension called ?Minidisk+?. This was made by a company called Cer-Comp. These PROMs are instead of Percom?s own ?MiniDOS PlusX (MPX) PROM. 

I?ve got the system working, and I can use Minidisk+ to save and load files, but I know I?m missing some nuances of command parameters. I don?t have any sort of documentation for Minidisk+, so before I go figure it out by disassembling the PROMs, does anyone have any sort of documentation for Minidisk+ by Cer-Comp for the Percom LFD-400 floppy disk controller?

Also, I?d like to burn the MPX PROM as an option. Does anyone have the MPX PROM or the source code for MiniDOS PlusX?


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