Service Manual

No.
I
1/0
Pin Name
Functior:.
85
I
I/0
BOIS
B-bus address/data bit
15
86
I
IROL
Light pen interrupt
87
I
IRQV
VDP2•V
blank interrupt
88
'
I
IRQH
VDP2•H
blank interrupt
89 I
BRDY2
VDP2 data ready
90 0
BCS2
VDP2
chip select
91
0
BADDT
· B-bus address/data switching signal
92
-
VSS
GND
93
0
BDTEN
B-bus data enable
94
- VDD
+SV
Power supply
95
0
BCSS
SCSP
chip select
96
I
BRDYS
SCSP
data ready
97 I
IRQS
SCSP
interrupt
98 0
BCSI
VDPI
chip select
99
I
BRDY1
VDPI data ready
100
I
IR1)1
VDPI interrupt
101
1/0
CAD
C-bus address bit 0
102 1/0
CAl
C-bus address bit 1
103
1/0
CA2
C-bus address bit 2
104
-
vss
GND
105
-
VDD
+SV
Power supply
106 I/0 CA3
C-bus address bit 3
107
1/0
CA4
C-bus address bit 4
108
1/0
CAS
C-bus address bit 5
109 1/0 CA6
C-bus address bit 6
110
-
VSS GND
Ill
1/0
CA7
C-bus address bit 7
112
1/0
CAS C-bus address bit 8
113
1/0 CA9 C-bus address bit 9
114
1/0
CAlO
C-bus address bit
10
115
-
VSS
GND
116
1/0 CAll
C-bus address bit 11
117 -
VDD
+SV
Power supply
118
1/0 CA12
C-bus address bit 12
119
1/0 CA13
C-bus address bit
13
120
1/0 CA14 C-bus address bit 14
121
-
vss
GND
122
I/0 CA15
C-bus address bit
15
123
I/0
CA16 C-bus address bit 16
124
I/0 CA17 C-bus address bit 17
125
I/0 CA18 C-bus address bit 18
126
I/0
CA19 C-bus address bit 19
127
-
VDD +SV Power supply
128
l/0
CA20· C-bus address bit 20
129
-
vss GND
130
1/0
CA21 C-bus address bit 21
131
1/0
CA22
C-bus address bit 22
132
l/0
CA23
C-bus address bit 23
133
1/0
CA24
C-bus address bit 24
134
1!0 coo
C-bus data bit 0
135
l/0
CDl
C-bus data bit 1
136
1/0
CD2
C-bus data bit 2
137
-
VSS
GND
138
1/0 CD3
C-bus data bit 3
139
-
VDD +SV Power supply
140
1/0
CD4
C-bus data bit 4
141
1/0
CDS
C-bus data bit 5
142
I/0
CD6
C-bus data bit 6
143
1/0
CD7
C-bus data bit 7
144
-
vss GND
145
1/0
CDS
C-bus data bit 8
146
1/0
CD9
C-bus data bit 9
-39-