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8272
TABLE
1.
8272
COMMAND
SET
I
DATA BUS
DATA BUS
PHASE
AIW
Dr
De
D6 D4 Da
DZ
D,
DO
REMARKS
PHASE
AIW
Dr
D,
D6
D4
Da
Dz
D,
DO
REMARKS
READ DATA
READ A
TRACK
Command
W
MT
MFM
SK
0 0
, ,
0
Command Codes
Command W
0
MFM
SK
0 0 0
,
0
Command
Codes
W
0 0 0 0 0
HDS OS,
DSO
W 0 0 0 0 0
HOS
051
DSO
W C
Sector
10
information
W C
Sector
10
Information
W
H
prior
to
Command
W H prior to
Command
W R execution
W R
execution
W
N
W
N
W EDT
W EDT
W
GPL
\
W
GPL
W
DTL
W
DTL
Execution Data transfer
Execution
Data transfer
between the
FOD
between the FDD
and main-system
and maln-Iystem.
Result R STO Status Information
FCC
road.
all
of
R
ST'
after Command
cylinders contents
R
ST2
execution
from
Index
hole
to
R
C
EDT
R H
sector
10
Information
R R
after command
Result R STO Statu8 Information
R N execution
R
STI
after
Command
R
ST2
execution
READ DELETED DATA
R
C
Command W
MT
MFM
SK
0
1
•
0 0
Command Codes
R
H
_____
Sector
10
Information
R R after
Command
W
0 0
0
0 0
HDS OS,
050
R
N
execution
W C
Sector
10
information
W H prior
to
Command
READ
10
W R execution
Command W 0
MFM
0 0 1 0
,
0
Commands
W N
W
EC.
W 0
0
0 0 0
HDS OS.
DSO
W GPL
W
DTL
Execution The
first
correct
10
Execution Data transfer
Information on the
between the
FOO
Cylinder Is stored In
and main-system
Data Register
Result
R STO
Status Information
Result R STO Status Information
R ST1 after Command
R
STI
after Command
R
ST2
execution
R
ST2
execution
R C
R C
R H Sector
10
information
R H Seotor
10
Information
R R after Command
R
R
during Execution
R N
execution
R N
Ph
...
WRITE DATA
FORMAT A
TRACK
Command W
MT
MFM
0
0
0
·1
0
•
Command Codes
Command
W
0
MFM
0 0
•
1
0
1
Command Codes
W
0 0 0 0 0
HOS 051
050
W
0 0 0 0
0
HDS OS.
DSO
W C
Sector
10
information
W N
BytellSector
W
H
prior
to
Command
W SC
SectorsfTrack
W R execution
W GPL Gap 3
W N
W
0
Fllt.r
Byt.
W EDT
W GPL
Execution FDC formats an
W DTL
entire cylinder
Execution
Data transfer
Result
R STO Status Information
between the main-
R
ST.
after Command
system and
FOO
R
ST2
execution
Result
R STO Status information
R C
R
ST.
after Command
R H
In
this
case, the
10
R
ST2
execution
R
R
information has
no
R C
R N meaning
R H Sector
10
information
SCAN EQUAL
R R
after
Command
R N execution
Command
W
MT
MFM
SK 1
0 0 0 1
Command Codes
WRITE DELETED DATA
W
0 0 0 0 0
HOS OS.
DSO
Command W
MT
MFM
0 0
•
0 0
1
Command Codes
W
C
Sector
10
information
W H
prior
to
Command
W 0 0 0 0 0
HDS OS.
DSO
W R execution
W C Septar
10
Information
W
N
W H
prior
to
Command
W EDT
W R
execution
W
GPL
W
N
W
STP
W EDT
W GPL
Execution Data compared
W DTL
between the FDO
Execution Data transfer
and main-system
between the
FOO
Result R STO Status Information
and main-system
R
STI
after Command
Aesult
R STO
Status information
R
ST2
execution
R
ST.
after Command
R
C
R
5T2
execution
R H
Sector
10
Information
R C
R R
after
Command
R H
Sector
10
information
R N
execution
R R after Command
R N execution
Note:
1.
Symbols used In
this
table are described
at
the
end
of
this
section.
2.
AO'" 1
for
all operations.
3.
X
...
Don't care, usually made
to
equal binary
O.
9-55