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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
READ A TRACK
Command
W
0
MF
SK
0
0
0
I
0
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
the FDD and main
system. FDD reads all
of cylinders contents
from index hole to EOT.
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
READ ID
Command
W
0
MF
0
0
I
0
I
0
Command Codes
W
X
X
X
X
X
HD
USI
usa
Execution
The first correct ID
information on the
cylinder is stored in data
register
Result
R
STO
Status information after
R
STI
command execution
R
ST2
R
C
Sector ID information
R
H
during execution
R
R
phase
R
N
X
=
Don't care.
3-29
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