IBM 5-1/4" Diskette Drive Adapter Hardware Reference Manual page 16

Data Bus
Phase R/W 07 06 05 04 03 02 01
DO
Remarks
Scan Low or Equal
, , ,
Command W
MT MF SK 0 0
Command Codes
W X X X
X X
HD US,
usa
W
C Sector ID information
W
H
prior to command
W
R
execution.
W
N
W
EOT
W GPL
W
STP
Execution
Data compared
between the FDD
and main system.
Result
R STO
Status information
R
ST'
after command
R
ST 2 execution.
R
C Sector ID information
R
H after command
R
R execution.
R
N
Command W MT
Scan High or Equal
MF SK
, , ,
0
,
Command Codes
W
X
X X X X
HD US,
usa
w
C Sector ID information
W H
prior to command
W
R execution.
W N
W
EOT
W GPL
W STP
Execution
Data compared
between the FDD
and main system.
Result
R STO Status information
R
ST'
after command
R
ST 2 execution.
R
C Sector ID information
R
H after command
R R execution.
R
N
12 Diskette Adapter