Service Manual

No. 1/0
Pin Name Function
23
0
AA5
A-bus address bit 5
24
0
AA6
A-bus address bit 6
25
0
AA7 A-bus address bit 7
26
0
AA8
A-bus address bit 8
27
-
VSS GND
28
0
AA9
A-bus address bit 9
29
0
AAIO A-bus address bit 10
30
0
AAll
A-bus address bit 11
31
-
VDD
Power supply +5V
32
0
AA12 A-bus address bit 12
33
0
AA13
A-bus address bit
13
34
0
AA14 A-bus address bit 14
35
-
vss GND
36
0 AA15
A-bus address bit
15
37
0 AA16 A-bus address bit 16
38
0 AA17
A-bus address bit 17
39
0
AA18
A-bus address bit
18
40
0 AA19 A-bus address bit 19
41
-
VDD Power supply +5V
42
0 AA20 A-bus address bit 20
43
-
vss
GND
44
0
AA21 A-bus address bit 21
45
0 AA22 A-bus address bit 22
46
0
AA23 A-bus address bit 23
47
0
AA24 A-bus address bit 24
48
0
AFCO A-bus function code bit 0
49
0
AFCI A-bus function code bit 1
so
0
AAS
A-bus address strobe
51
0
ACSO
A-bus chip select 0
52
'
-
VSS GND
53
0
ACSI
A-bus chip select 1
54
0
ACS2
A-bus chip select 2
55
-
VDD Power supply +5V
56 I
AWAIT
A-bus external wait
57
I
All:«)
A-bus external interrupt factor
58
I
TEST
Test mode selection (normally, input
"H")
59
0
ARD
A-bus read pulse
60
0
AWRU
A-bus byte
0 (AD15-8) write pulse
61
0
AWRL
A-bus byte 1
(AD7-0) write pulse
62
-
VSS GND
63
0
ATIMO
A-bus external access timing 0
64
0
A TIM I
A-bus external access timing 1
65
0
ATIM2
A-bus external access timing 2
66
1/0 BDO B-bus address/data bit 0
67
1/0
BDl B-bus address/data bit 1
68
1/0 BD2
B-bus address/data bit 2
69
- VDD Power supply +5V
70
1/0
BD3
B-bus address/data bit 3
71
- VSS GND
72 1/0
BD4
B-bus address/data bit 4
73
1/0
BD5 B-bus address/data bit 5
74
1/0 BD6
B-bus address/data bit 6
75
1/0
BD7
B-bus address/data bit 7
76
1/0 BD8
B-bus address/data bit 8
77
I/0
BD9
B-bus address/data bit 9
78
1/0
BDlO
B-bus address/data bit 10
79
-
VDD
Power supply +5V
80
1/0
BOll
B-bus address/data bit 11
81 - vss GND
82
I/0
BD12
B-bus address/data bit 12
83
1/0
BD13
B-bus address/data bit 13
84
I/0
BD14
B-bus address/data bit 14
-38-