Hello World!
I have recently finished building an Altair 8800c. My current configuration contains a reproduction Altair CPU card, Mike's front panel interface and FDC+ controller cards, and a 2SIOJP serial card. I have successfully run Kill-The-Bit on the front panel. I have also run Altair Disk Basic, Altair DOS, and Lifeboat CP/M 2.2 from the floppy disk drives.
I am using three Teac FD-55GFR drives. All three drives successfully write to and read from their media; however, the media is not interchangeable between drives. A disk written in drive 0 cannot be read in drive 1 or 2. A disk written in drive 1 cannot be read in drives 0 or 2. And the same issue is present when attempting to exchange media written in drive 2 with drives 0 and 1. I have tested this with CP/M and Altair DOS formatted disks.
I applied grease to the transport rails on all three drives and cleaned their read/write heads. This did not make any difference. Now I am thinking that maybe the alignment is out on the drives.
For floppy disk media I am using Maxell MD2HD disks I recently unsealed.
Has anyone here struggled with the same issue I am having? If so, how did you fix it?