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NO.
SIGNAL
60
XMDMINT
61
XMDMCS
62
XRAS/IOP
63
XCAS1/IOP
64
XCAS2/IOP
65
XRESCS2
66
DB3
67
DB2
68
DB4
69
DB1
70
DB5
71
VDD (3.3V)
72
VSS
73
VSS
74
VDD (3.3V)
75
DB0
76
DB6
77
DB7
78
XROMCS
79
RD
80
WR
81
ADR0
82
ADR1
83
ADR2
84
ADR3
85
ADR4
86
ADR5
87
VSS
88
VDD (2.5V)
89
ADR6
90
ADR7
91
ADR8
92
ADR9
93
ADR10
94
ADR11
95
ADR12
96
RBA0
97
RBA1
98
RBA2
99
RBA3
100
RBA4
I/O
POWER
SUPPLIED
VOLTAGE
I
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
I/O
3.3V
I/O
3.3V
I/O
3.3V
I/O
3.3V
I/O
3.3V
-----
GND
GND
3.3V
I/O
3.3V
I/O
3.3V
I/O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
GND
-----
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
O
3.3V
155
DESCRIPTION
MODEM INTERRUPT
MODEM CHIP SELECT
DRAM (IC503) ROW ADDRESS STROBE
DRAM (IC503) CULUM ADDRESS STROBE
DRAM(IC503) CHIPSELECT
GATE ARRAY CHIP SELECT
CPU DATA BUS 3
CPU DATA BUS 2
CPU DATA BUS 4
CPU DATA BUS 1
CPU DATA BUS 5
POWER SOURCE (+3.3V)
POWER SOURCE (GND)
POWER SOURCE (GND)
POWER SOURCE (+3.3V)
CPU DATA BUS 0
CPU DATA BUS 6
CPU DATA BUS 7
ROM (IC523) CHIP SELECT
CPU RD
CPU WR
CPU ADDRESS BUS 0
CPU ADDRESS BUS 1
CPU ADDRESS BUS 2
CPU ADDRESS BUS 3
CPU ADDRESS BUS 4
CPU ADDRESS BUS 5
POWER SOURCE (GND)
POWER SOURCE (+2.5V)
CPU ADDRESS BUS 6
CPU ADDRESS BUS 7
CPU ADDRESS BUS 8
CPU ADDRESS 9
CPU ADDRESS 10
CPU ADDRESS 11
CPU ADDRESS 12
ROM/RAM BANK ADDRESS 0
ROM/RAM BANK ADDRESS 1
ROM/RAM BANK ADDRESS 2
ROM/RAM BANK ADDRESS 3
ROM/RAM BANK ADDRESS 4
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Troubleshooting
