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NEC
Command
W
0
MF
0
0
1
0
1
0
Commandcodes
Execution
Resuit
R
-
S T O
Status information alter command ixecution
W
X
X
X
X
X
HD
US1
US0
The first correct ID information on the cylinder is stored in data
register.
R
STl
R
ST2
R
R
-
-
disk.
R
R
-
Sector ID information read during execution phase from floppy
F o n l
A
lhck
Command
W
0
MF
0
0
1
1
0
1
Commandcodes
W
X
X
X
X
X
HD
US1
US0
w
-
-
Byteslurctor
W
sc
-
Sectonhack
W
GPL
Gap 3
W
Filler byte
Execution
FDC formats an entire track.
Result
R
-
S T O
-
Status information alter command execution
R
ST1
R
ST2
R
R
R
R
-
In this case,
the ID information has
no
meaning
Sun Equal
Command
W
MT
MF
SK
1
0
0
0
1
Commandcodes
W
X
X
X
X
X
HD
US1
US0
W
-
Sector ID inlormation prior to command execution
W
w
-
w
-
w
-
EOT
W
GPL
W
STP
Execution
Result
R
ST O
-
Status information aner command execution
Data compared between the FDD and main system
R
ST1
R
ST2
R
-
Sector ID information after command execution
R
R
R
N o t . :
(1)
Symbols
used in
this table are described
at the
end
of this
section.
(2)
AO should
equal
1
for ail operatlons.
(3) X
=
Don't care, usually made to equal 0.
6-1 5
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