I have a Percom AT88-S1PD (and manual), and wanted some verification on the following:
The Percom hardware can support up to 2 floppy drives internally? including 3.5"drives?
If you put a 3.5" drive inside -- do you end up with 360KB or 720KB of usable space? and does any standard PC 720KB mechanism work (or old ST floppy)?
Finally, can the floppy be formatted to the PC Standard of FAT12 and accessed by SpartaDOS-X ?
I did test part of this many years ago using my AT-88, which supported DD. I'm not sure about your model number, but I believe it may be single density only. (?) So that means the most you should get is 128 X 18 X 80 (tracks) X 2 (sides) = 360K, if it handles a two-sided drive. If it is DD, then it should be 720K using 3-1/2" 720K drives using MyDos (or SDX). And dead-slow in DD since there is no USpd for Percoms. It's been a really long time since I did this.
As far as the Fat-12, I can only say that I used my Percom with my ATR 8000 & CP/M (which has some very different disk formats), but I did not use the Percom controller, since the ATR 8000 handles that. But how would you even do it?
Is your manual different than the regular AT-88 manual? It is manual #050-1290-001? I would think a manual specifically for the AT-88 S1PD might be slightly different. (?)
Here is a link that might be helpful:
There was also a good article by Ben Poehland in Atari Classics about the Percoms.
And last... be very careful as the Percom has 110V inside (U.S.) and it can shock you in a heartbeat if you touch the wrong things!