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Controller PCB
Table 3-9 FDC Commands (cont'd)
READ/
DATA BUS
PHASE
WRITE
D7
D6
D5
D4
D3
D2
DI
DO
REMARKS
WRITE DATA
Command
W
MT MF
0
0
0
I
0
I
Command Codes
W
X
X
X
X
X
HD
USI
usa
W
C
Sector ID information
W
H
to command execution
W
R
W
N
W
EOT
W
GPL
W
DTL
Execution
Data transfer between
the main system and
FDD
Result
R
STO
Status information after
R
STI
command execution
R
ST2
R
C
Sector ID information
R
H
after command
R
R
execution
R
N
WRITE DELETED DATA
Command
W
MT MF
0
0
I
0
0
I
Command Codes
W
X
X
X
X
X
HD
USI
usa
W
C
Sector ID information
W
H
prior to command
W
R
execution
W
N
W
EOT
W
GPL
W
DTL
Execution
Data transfer between
FDD and main system
Result
R
STO
Status ID information
R
STI
after command
R
ST2
execution
R
C
Sector ID information
R
H
after command
R
R
execution
R
N
X
=
Don't care.
3-28
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