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TABLE
1.
COMMAND SET (Continued)
I
DATA BUS
I I
DATA BUS
PHASE
RIW
I
D7 De
D5
D4
D3 D2
Dl
DO
REMARKS PHASE RIW 0
7
D6 D5
D4 D3 D2
Dl
DO
REMARKS
SCAN LOW
OR
EQUAL RECALIBRATE
Command
W
MT MFM
SK
1
1
0 0 1 Command Codes Command W 0 0 0
0
0 1 1 1 Command Codes
W 0 0 0 0 0 HDS
DSl
DSO
W
0
0
0
0 0 0
DSl
DSO
W C
Sector lD information
Execution Head retracted to
W H
prior
Command
Track 0
W R execution
W
_____
N
SENSE INTERRUPT STATUS
W
EOT
Command W 0 0 0 0 1
0
0 0 Command Codes
W GPL
W
STP
Result R
ST
0 Status Information
at
R
PCN
the end
of
each seek
Execution
Data compared
operation about the
between the
FOD
FDC
and main-system
SPECIFY
Result
R
STO Status
Information
Command W 0 0 0 0 0 0 1 1 Command Codes
R
STl
after Command
W
_SPT
___
..
.....---HUT
R
ST2
execution
-
R C
W
HLT
•
NO
R
H
Sector
10
Information
SENSE DRIVE STATUS
R R
after
Command
R N execution
Command W
0 0 0 0
0
1
0
0
Command Codes
SCAN HIGH
OR
EQUAL
w
0 0 0 0 0
HDS
DSl
DSO
Result
R
ST
3
Status Information
Command
W MT
MFM
SK 1
1 1
0 1
Command
Codes
about FoD
W
0
0 0 0 0 HDS DSl
DSO
SEEK
W C
Sector
10
information
W H prior Command
Command
W
0
0
0 0
1 1 1 1 Command Codes
W
R execution
W 0 0 0 0 0
HDS
DSl
DSO
W N
W NCN
W EOT
W GPL
Execution
Head
Is positioned
W
STP
over proper Cylinder
Execution Data compared
on Diskette
between the FDD
INVALID
and main-system
Command W
____
Invalid Codes
____
Invalid Command
Result
R
STO Status
Information
Code.
(NoOp-
FDC
R
ST
1 after Command
goes
Into Standby
R
5T2
execution
Stale)
R C
Result R 5TO
STO=80
R H Sector
10
Information
(16)
R R
after
Command
R N execution
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