Command Summary - IBM 5-1/4" Diskette Drive Adapter Hardware Reference Manual

Command Summary
In the following table, 0 indicates "logical 0" for that bit, 1 means
"logical 1," and X means "don't care."
Data Bus
Phase
R/W
D7 D6 D5 D4 D3 D2 D1
DO
Read Data
Command W MT MF SK
0 0 1 1 0
W
X X X X X HD US1USO
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
Execution
Result R ST 0
R ST 1
R ST 2
R C
R
H
R R
R N
Read Deleted Data
Command W MT MF SK 0 1 1 0 0
W
X X X X X HD US1USO
W
C
W
H
W
R
W N
W EOT
W GPL
W DTL
Execution
Result
R STO
R ST 1
R ST 2
R
C
R
H
R R
R N
Remarks
Command Codes
Sector ID information
prior to command
execution.
Data transfer
between the FDD
and main system.
Status information
after command
execution.
Sector ID information
after command
execution.
Command Codes
Sector ID information
prior to command
execution.
Data transfer
between the FDD
and main system.
Status information
after command
execution.
Sector ID information
after command
execution.
8 Diskette Adapter