Tandy 1000 SL Technical Reference Manual page 191

Table 4. lnsiruciion Sei (Notes 1,2)(coni)
lnrtrvstlon Cod0
Phaw
RIW
D, De
DB D4 D)
De
D(
Do R.nurlu
Sean Low
or
Equal
Command W MT MF SK 1 1 0 0 1 Commandcodes
W X X X X X HD US1 US0
W
w -
W
z
P
-
Sector ID information prior to command execution
W
W
EDT
w -
GPL
W STP
Execueon
Data compared between the FDD and main system
Result R - ST 0
-
Status information after command execution
R - ST1
R -
ST 2
R -
-
Sector ID information after command execution
R
R
Scan
High
or Equal
Command W MT MF SK
1
1
1
0
1
Commandcodes
W X X X X X HD US1 US0
w -
-
Sector ID information prior to command execution
w -
W
W
W
EDT
w -
GPL
w -
STP
Execution
Data compared between the FDD and main system
Resuit R - ST 0
-
Status information after command execution
A - STl
A -
s r 2
R
-
Sector ID information after command execution
R -
R
R
Command W 0 0
0 0 0
1
1
1 Commandcodes
Execution
w
x
x x x x
0 us1 us0
Head retracted to track 0
sense
Interrupt status
Result R STO
-
Status information about the FDC at the end of seek operation
Command
W
0 0 0 0 1
0
0
0
Commandcodes
R PCN
WdfY
Command W 0 0 0 0
0
0 1
1
Commandcodes
W
W H LT
-
ND
-
SRT
- -
HUT
-
Senre Dlks Status
Command
W 0
0
0 0 0 1 0
0 Commandcodes
W
X X X X X HD US, US0
Result R ST 3 Status information about FDD
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