參數(shù)資料
型號(hào): 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(pán)控制器
文件頁(yè)數(shù): 16/17頁(yè)
文件大小: 344K
代理商: UPD765A
Table 4. Instruction Set
(Notes I,
Version
Command
w
x
x
x
1
0
0
0
0
Command codes
Indicates 7658
indicates
Seek
Command
W
W
W
0
X
0
0
0
1
1
1
1
Command
code
X
X
X
X
HD
US,
N C N
Execution
Invalid
Command
Head
IS
positioned over proper cylinder on diskette
W
Codes
Note:
(1)
Symbols used in this table are described at the end of this section.
(2)
(3)
Don’t care, usually made to equal 0.
should equal 1 for all operations.
Invalid Command codes (No op-
goes
state)
System Configuration
Figure 2 shows an example of a system using a
Figure
2. System Configuration
5-18
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