Posted Fri May 17, 2019 7:15 PM
After using the 551 board for 6 weeks to test different 3.5 drives; I decided that I would finally install it in a case with a 3.5 drive mech. After getting it in the case, I booted up with MYDOS and tried to format a disk. The process seemed to be working but then I got an error 163. The same thing happened with 3 other disks. After experimenting with several other disks, I found that it would only boot with MYDOS, I assumed that was because the MYDOS disk was double density. If I set the drive as drive 2, and boot drive 1 with DOS 2.5; the computer doesn't even acknowledge that there is a drive 2. Is this also because of the double density of the 3.5 drive. I have tried two different ROM B ICs and get the same results. I can't format a disk. I tried ten different disks and get the same results. Any suggestions.