I have this, if it helps, but it's probably compiled: https://vintagecomputer.net/commodore/IEEE_drives/sfd-1001%20test.PRG You might also want to check SFD-1001 utils. as it's more or less the single drive version of the 8250 Bill On Fri, Dec 23, 2022 at 1:16 PM Francesco Messineo < francesco.messineo_at_gmail.com> wrote: > Hi all, > I need to diagnose a faulty 8250 disk drive (actually a LP one). Years > ago I found a nice program that works with a 1541 that allows turning > on/off the spindle motor, seek to track 1 (i.e. bump the head to the > stop), seek 1 or 1/2 track in and out. This is very handy to observe > the analog signal path issues. Now I understand that this can be > easily done on a 1541 since the same CPU is controlling the > interface/DOS and the actual stepper/spindle outputs. > Now, the 8250 obviously has two CPUs and the spindle/stepper one only > executes so called "jobs" posted from the other CPU. I can see > there're seek/read/write jobs but it seems to me that all will look > for an actual sector header and throw back an error if that can't be > found correctly. > Before I dig deeply into the ASM code of the 8250's DOS, can anyone > point me in the right direction to write such a tool (start, stop, > step in/out) for dual CPU drives? Maybe a modified format track > without switching to write mode? My other option would be writing a > custom ROM for the 6530 code (that's already on a separate eprom on > the LP, so nothing *too* hard to do). > Thanks in advance. > Frank IZ8DWF > >Received on 2022-12-23 20:02:40
Archive generated by hypermail 2.3.0.