Service manual

..
No.
110
Name Function
57
-
vss
Ground
58
SDLll
59
SDL12
60
I
SDL13
SH uP
subdata bus
61
SDL14
62
SDL15
63
- vee
Power supply
64
-
vss
Ground
65
SA21
66
SA20
67
I
SA4
SH uP
address bus
68
SA3
69 SA2
70
I
SRD
SH uP
read enable signal
71
- vss Ground
72 I
SHCK
20MHz
clock
73 I
SAl
SH uP address bus
74
I
IRQOUT SH uP interrupt factor generation signal
75
I SCS2
SH uP
chip select 2
76
I
DACKl
Channel 1 DMA transfer response
77
-
vee
78
-
vss Ground
79
I DACKO
Channel 0 DMA transfer response
80
CASH
DRAM control signal
81
I
CASL
82
I
SWRH SH uP upper byte write enable signal
83
I
SWRL SH uP lower byte write enable signal
84
I
SA19 SH uP address bus
85
I TP3
Test pin
86
-
vss Ground
87
0
DSWR Delayed write cycle control signal
88
0
DREQ1 Channel 1 DMA transfer request
89
0
DREQO Channel 0 DMA transfer request
90
I SDH15 SH uP main data bus
91
- vee
Power supply
92
-
VSS Ground
. 93
SDH14
94
SDH13
95
I SDH12
SH uP
main data bus
96
SDH11
97
SDH10
98
-
VSS Ground
99
SDH9
Power
supply
100
SDH8
101
I
SDH7
SH uP
main data bus
102 SDH6
103 SDH5
104
- vee
Power supply
105 - vss
Ground
106
SDH4
107
SDH3
108
I
SDH2 SH uP main data bus
109
SDH1
110
SDHO
111
0
SIRQH
SH uP
upper byte (CD-ROM) interrupt signal
112
-
vss
Ground
-68-