Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer, Service Manual

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Appendix
Service
Table A-5. Pin Assignments (Continued)
Pin No.
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Pin No.
1,2,3,4
5
6
7
8
9
10
11
12
13
14
15
16,17
18,19
20
21
22
23
24
25
26
27
28
29
30
Signal Name
A25
NC
BGAT
o
0
—
o
0
o
0
I
I
—
o
0
Address bus bit 25
Byte enabfes O
Not connected
Bus request
Bus grant
Bus grant for external device
Bus request for external device
Byte enables 2
Byte enables 3
Option ready
Interrupt request bus bit O
Interrupt request bus bit 1
request bus bit 2
Interrupt request bus bit 3
CPU ID bit
CPU ID bit O
Table A-6. Pin Assignments
Signal
Name
DTCT
DREQ
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DBO
—
o
0
0
0
0
0
0
0
0
0
—
—
o
0
0
I/o
I/o
I/o
Description
+5
VDC
Interrupt
interrupt
Reset signal
Address bus bit 4
Address bus bit 3
Clock
to option
Data request
Write strobe
Read strobe
option select
Ground
Address bus bit 2
Address bus bit 1
Address bus bit O
Data bit 7
Data bit 6
Data bit 5
Data bit 4
Data bit 3
Data bit 2
Data bit 1
Data bit O
,
A-10
Rev.