9 Sep
2020
9 Sep
'20
2:09 p.m.
Fred Cisin via cctalk:
(...')
Got an IBM "Advanced Diagnostics" floppy to
try?
If you want to do a ll-format, you only need debug:
A>DEBUG
-
-I 322 # reads dip-switches (don't think this is needed)
-I 321 # read status
-O 322 0 # select the controller
-I 321 # read status
-O 320 04 # ll-format instruction
-O 320 00 # 00 for drive C, 20 for drive D
-O 320 00
-O 320 00
-O 320 05
-O 320 07
the six "O 320" issue the "low-level format" instruction directly to
the
controller. Bit 5 in 2nd byte represents the drive.
Do not expect any feedback, this is not a program, this is a direct
communication with the controller via in/out instructions. The ll-format
process is done in the controller's firmware and the Xebec-controllers
are very slow.
--
Martin Peters
martin at shackspace.de