Casio AT-1 Service Manual page 11

Pin No. Terminal
96 EWEB
98 EA13
106 EOEB
108 VCC7
111 ECEB
113 ~ 117
118 VCC4
119 GND4
120 ~ 122
123 ~ 130 ED0 ~ ED7 In/Out
131 GND5
132 ~ 134
135, 136
Block diagram of DSP and DAC circuit
D0 ~ D7
A0 ~ A3
A13
A14
RD
APO
WR
RESET
In/Out
Out Write enable signal output for the effect RAM
Out Not used
Out Read enable signal output for the effect RAM
In +5 V source
Out Chip select signal output for the effect RAM
Not used
In +5 V source
In Ground (0 V) source
Not sued
Data bus for the effect RAM
In Ground (0 V) source
Not used. Connected to ground.
Not used
Sound Source ROM
LSI103
TC5316200CP-C106
CE A0 ~ A19
RA0 ~
RA22
RA19
DSP
LSI105
CCSB
HG51B155FD
CRDB
CWRB
ECEB EOEB EWEB
ED0 ~
OE WE
CS
ED15
D0 ~ D15
Effect RAM (64K-bit)
LSI107
SRM2264LC90,10
— 9 —
Function
SOLP: Sound data
D0 ~ D15
BOK: Bit clock
WOK1: Word clock
RD0 ~
RD15
SOLP
SI
BOK
CLK
WOK1
LRCK
UPD6376CX
PG
X102
16.384MHz
EA0 ~
EA12
A0 ~ A12
DAC
LSI101 ROUT
LOUT