I have an 8800c I built myself. It's been running great up until now. I have the FDC+ board in it with the full 64K mod described on page 5 of the manual.
The FDC+ is set to use my two HD 5.25" floppy drives as 8" Altair disks.
I just updated the FDC+ firmware from version 1.3 to version 1.7 and, after a hand from Mike Douglas, the update seemed to go perfectly.
The system is using Altair Disk Extended BASIC ver. 300-5-F.
I can mount and unload with no problem. I can execute the FILES and LOAD commands for both drives 0 and 1.
What I can't do, however is SAVE a BASIC program! When I try, the BASIC OK prompt reappears quicker than it should with no error message.
When I try to find the file on the disk, however, it's not there. If I try to SAVE using a filename already on the disk, that filename disappears from the disk.
I may try to revert to FDC+ firmware 1.3 if I can find it anywhere to see if the problem goes away. All I can find online is 1.6.
Any ideas what might be happening?