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參數(shù)資料
| 型號： | UPD765A |
| 廠商： | NEC Corp. |
| 英文描述： | Single/Double Density Floppy-Disk Controller |
| 中文描述： | 單/雙密度軟盤控制器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大小： | 344K |
| 代理商： | UPD765A |
NEC
uPD765A/uPD765B
Table 4. Instruction Set (Notes
1,2)
(cont)
instruction Code
Phase
Write Data
Command
Remarks
W
W
W
MT
X
MF
X
0
0
0
1
0
1
Command codes
X
X
-
X
HD
c
H
R
Sector ID information prior to command execution. The 4
are compared against header on floppy
W
W
W
EOT
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
W
W
W
W
MT
X
MF
X
0
0
1
0
1
Command codes
X
X
X
HD
US,
C
Sector Information prior to
are compared against header on floppy disk
The 4 bytes
R
-
p
-
-
-
-
-
N
EOT
GPL
DTL
-
W
w
w
Execution
Result
Data transfer between the FDD and main system
Status information after command execution
ST1
ST2
C
H
Sector ID information after command execution
R
N
Read Diagnostic
Command
w
W
W
W
w
W
W
W
w
0
X
MF
X
SK
0
0
0
1
0
Command codes
X
X
X
HD
Sector
prior to command execution
H
R
N
EOT
GPL
DTL
Data transfer between the FDD and main system
data fields from index hole to EDT.
Status information after command execution
FDC reads all
Result
ST1
S T 2
C
H
N
Sector ID Information after command
5- 15
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|---|---|
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