Instruction
Set
(4)
Instruction Code
-
Phase
R/W
D, Ds D,
D,
D, D, D,
Do
Remarks
Read
ID
Command
W
0
MF
0
0
1
0
1
0
Command codes
W
X
X
X
X
X
HD
US, US,
Execution
Result Ri STO
Status information after command execution
The first correct ID information on the cylinder is stored in
data register.
R4: ST
1
f
Ri ST2
f
R+ C Sector ID information read during excecution phase from
Ri H
floppy disk.
R+- R
f
Ri
N
f
Format a Track
Command
W
0
MF
0
0
1
1
0
1
Command codes
W
X
X
X X X
HD
US,
US,
wi
N
Bytedsector
wi
sc
Sectors/track
We
GPL Gap3
w.
D Filter byte
Execution
Result Ri STO
+
Status information after command execution
FDC formats an entire track.
R+ ST
1
Ri ST2
f
R+- C
f
In this case, the ID information has no meaning
Ri H
f
R+- R
f
R+
N
+
~
Scan Equal
Command
W
MT
MF
SK
1
0
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
f
w+
R
wi
N
f
wi
EOT
f
W+
GPL
w.
STP
f
Ri ST
1
+
Ri ST2
f
Ri
C
f
Sector ID information after command execution.
Result
Re
STO Status information after command execution
R+- H
R+ R
Ri
N
F-30
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