— 26 —
N o .
Pin Name
I o / O u t
Function
To/From
119
CASHHB / CAS2HB
O
D31-D24 / D15-D8 select signal
BGA288,ROM Board
120
CASHLB / CAS2LB
O
D23-D16 / D7-D0 select signal
BGA288,ROM Board
121
Vss
GND
122
Vcc
+3.3V source
123
WE1B
O
D15-D8 select signal
BGA288
124
WE0B
O
D7-D0 select signal
BGA288,LCD uint,ROM Board
125
CASLHB
O
D15-D8 select signal
BGA288,ROM Board
126
CASLLB / OEB
O
D7-D0 select / memory select signal
BGA288,ROM Board
127
Vss
GND
128
Vcc
+3.3V source
129
RASB / CEB
O
CE signal for RAM,ROM
BGA288,RAM,ROM Board
130
MD5 / RAS2B
Not used
131
HSTBYB
I
Not used
+3.3V source
132
WAITB
I
Hardware wait request
BGA288
133
Vss
GND
134
RTCCLK
O
RTC clock output
BGA288
135
Vcc(RTC)
+3.3V source(for internal RTC)
136
XTAL2
O
Oscillator terminal(for internal RTC)
C6
137
EXTAL2
I
Oscillator terminal(for internal RTC)
C6
138
Vss(RTC)
GND(for internal RTC)
139
Vcc
+3.3V source
140
D31
I/O
Data bus
141
D30
I/O
Data bus
142
D29
I/O
Data bus
143
D28
I/O
Data bus
144
Vss
GND
Summary of Contents for Cassiopeia A-20
Page 1: ...Handheld Personal Computer A 20 ZX 340 R DEC 1997 without price A 20...
Page 23: ...20 7 Restoring starts 8 Click OK...
Page 72: ...69 PCB VIEW...
Page 76: ...73 Z370 ROM PCB ROM To Z340 1 PCB 1 3 MAIN CN7...
Page 77: ...74 Z340 DPMI PCB MIC To Z340 LED PCB LED CN5 From Z340 1 PCB 1 3 MAIN CN4 To LCD unit CN1...
Page 80: ...CASIO TECHNO CO LTD 8 11 10 Nishi Shinjuku Shinjuku ku Tokyo 160 Japan Telephone 03 3347 4926...
