SWTPC 6800 and Percom Floppy Controller

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


 Greg,

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.

Mike
     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?

Mike
  


More information about the cctech mailing list