I have typed in the assembly source for couple of the missing utilities for which I was looking (there are a few listings in the LFD-400 manual), so I now have a pretty complete and useful Percom disk system for the SWTPC 6800. I also wrote FLOP2PC and PC2FLOP utilities to archive a disk to a PC and to write a disk from an archived image saved on a PC. The disk images are transferred over a serial port using the XMODEM protocol.
If anyone ever runs across one of these Percom disk controllers in the future, feel free to contact me. Mike > On Jan 7, 2020, at 6:44 PM, Mike Douglas <deramp5...@yahoo.com> wrote: > > 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
