11 Sep
2012
11 Sep
'12
8:34 p.m.
On 11 Sep 2012 at 17:16, Fred Cisin wrote:
Start with the computer!
Get it to try to boot, and see which lines change state on the cable.
If it's pin 12, then PC jumpering of the drive might work. If it's pin
10, then it mimics the civilized world.
THEN jumper the drive to match what the computer is sending.
With 8" drives, you can often set the motor to just stay running.
Got a scope?
Once you have drive select, motor on, and head load, then start
looking for data.
In addition, most 5.25" HD drives use pin 34 on the interface for
DISK CHANGED rather than READY. 8" drives all have READY outputs (a
few have an option for DISK CHANGED in addition).
--Chuck