jonb wrote:hoglet wrote:
What's bothering me here is that PIP is crashing all the time when copying from A: to B:. Yet the memory is fine.. so I am beginning to wonder if it is caused by the ROM (which has all the FDC routines in it) having a 40 track setup but the CP/M BIOS only using 35. These are known things with the Superbrain - from the factory the machine did 35 tracks, but there were 3rd party BIOSes that allowed 40. The Tandon drives are 40T DS DD or SS DD, but still 40 tracks. Hmm.
Did you change the EPROM code to allow 40 tracks?
It could be that a mismatch with CP/M is causing a problem but unlikely the EPROM code is over written when the system tracks are read from the boot disk. Try changing the EPROM back to 35 tracks and rule it out.
The problem with the 3rd party BIOSes was the incompatibilty issues between machines a bit like the Kaypro lineup.