Instruction Code
-
Phase R/W D, D, D, D, D, D, D,
Do
Remarks
Execution Data transfer between the FDD and main system
Result R* STO
’
Status information after command execution
Ri ST
1
+
Ri ST2
-+
Ri C
+
Sector ID information after command execution
R+
H
’
R+ R
Write Deleted Data
Command
W
MT
MF
0 0
1
0 0
1
Command codes
W
X
X
X X X
HD
US, US,
w+
C
+
Sector ID information prior to command execution. The
4
W+
H
-+
bytes are compared against header on floppy disk.
w+
R
+
wi
N
’
wi
EOT
+
W+
GPL
’
w+
DTL
-*
~
Execution
Result R
R
R
R
R
R
R
Data transfer between the FDD and main system
c
STO
’
Status information after command execution
i
ST
1
-+
i
ST2
’
4-
C Sector ID information after command execution
+
H
’
i
R
N
+
Scan
Low
or Equal
Command
W
MT
MF SK
1
1
0
0
1
Command codes
W
X
X X X X
HD
US,
US,,
w*
C Sector ID information prior to command execution.
w.
H
-+
wi
R
’
wi
N
wi
EOT
’
wi
GPL
’
W+
STP
’
Execution
Result Ri STO
+
Status information after command execution
Data compared between the FDD and main system.
Ri ST
1
’
R+ ST2
’
Ri C Sector ID information after command execution
Ri H
’
R+ R
F-27
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