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Controller PCB
Table 3-9 FDC Commands (cont'd)
READ/
DATA BUS
PHASE
WRITE
D7
D6
D5
D4
D3
D2
D]
DO
REMARKS
FORMAT TRACK
Command
W
0
MF
0
0
]
]
0
0
Command Codes
W
X
X
X
X
X
HD
US]
usa
W
N
Bytes/Sector
W
SC
Sector/Track
W
GPL
Gap 3
W
D
filler byte
Execution
FDC formats an entire
cylinder
Result
R
STO
Status information after
R
ST]
command execution
R
ST2
R
C
In this case, the ID
R
H
information has no
R
R
meaning
R
N
SCAN EQUAL
Command
W
MT MF
SK
]
0
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 after
R
STI
command execution
R
ST2
R
C
Sector ID information
R
H
R
R
R
N
X
=
Don't care,
3-30
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