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UPD765B Datasheet(PDF) 13 Page - NEC

No. de pieza UPD765B
Descripción Electrónicos  Single/Double Density Floppy-Disk Controller
PDF  17 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD765B Datasheet(HTML) 13 Page - NEC

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NEC
uPD765A/uPD765B
Table 4. Instruction Set (Notes 1,2) (cont)
instruction Code
Phase
Write Data
Remarks
Command
W
MT
MF
0
0
0
1
0
1
Command codes
W
X
X
X
X
X
HD
W
-c
Sector ID information prior to command execution. The 4
H
are compared against header on floppy
WR
W
EOT
W
GPL
DTL
ST2
C
H
Data transfer between the main system and FDD
Status
after command execution
Sector ID information after command execution
R
R
N
Write Deleted Data
Command
W
MT
MF
0
0
1
0
1
Command codes
W
X
X
X
X
X
HD
US,
W
C
Sector
Information prior to
The 4 bytes
W
are compared against header on floppy disk
W
R
-p-----N-
W
EOT
w
GPL
w
DTL
Execution
Data transfer between the FDD and main system
Result
ST1
Status information after command execution
ST2
C
H
Sector ID information after command execution
R
N
Read Diagnostic
Command
w
0
MF
SK
0
0
0
1
0
Command codes
W
X
X
X
X
X
HD
W
Sector
prior to command execution
W
H
w
R
W
W
W
N
EOT
GPL
w
DTL
Data transfer between the FDD and main system
FDC reads all
data fields from index hole to EDT.
Result
ST1
ST2
C
H
N
Status information after command execution
Sector ID Information after command
5-15



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