OK, I've got the system set up on my 'test bench.' The system powers up and says: ---------------------------------------------------- ALTOS COMPUTER SYSTEMS Monitor Version 5.03 Insert Floppy Disk in Drive 1 for Autoload ---------------------------------------------------- Ok, now I insert a disk into drive 1 (which has it's LED on, close the door, it comes up to speed, and then nothing happens. The drive heads do not load onto the disk liked they're supposed to. A quick check with my multimeter reveals that all the PS voltages (including +24V) are pretty close to their ratings. All the cables are seated securely, Swapping the drives fixed the problem, and it will now boot 32K Altos CP/M 2.2. Sort of a waste with 208K of RAM, but I guess I'll try to figure out how to manufacture an MP/M-II BIOS for it, and get it onto a disk. CP/M-1.4 won't boot, however. It does read OK once I've booted CP/M 2.2, so it might just be a problem with its first track (it doesn't seek at all either). Same problem with the 'CP/M diagnostics disk' Any ideas? I've got a CDC 8" SS drive I got off ebay a few months ago I might try to use to replace these drives. Does anyone know if it's possible to use four drives on the system, since the drives have a DS1-DS4? Also, is there a way to run the diagnostic programs (.DIA files on the diagnostics disk) without booting from it? Pretty soon, i'll probably be digging into some CP/M source and attempting to at least get a 64k version running on here... Thanks -- Pat