Casio WK-1500 Eoeb, VCC7, Eceb, VCC4, GND4, GND6, LSI12, Solp DAC IC11 Rout, LSI17, BOK WOK1, ED7

Pin No.	Terminal	In/Out	Function
106	EOEB	Out	Read enable signal output for the effect RAM
108	VCC7	In	+5 V source
111	ECEB	Out	Chip select signal output for the effect RAM
113 ~ 117	ED11 ~ ED15	—	Not used
118	VCC4	In	+5 V source
119	GND4	In	Ground (0 V) source
120 ~ 122	ED8 ~ ED10	—	Not used
123 ~ 130	ED0 ~ ED7	In/Out	Data bus for the effect RAM
131	GND6	In	Ground (0 V) source
132 ~ 134	—	—	Not used. Connected to ground.
135, 136	—	—	Not used

Block diagram of DSP and DAC circuit

Sound Source ROM

LSI12

MX23C2410MC-12CA51

	CE A0 ~ A20		Q0 ~ Q15
RA22		RA0 ~	RD0 ~
		RA20	RD15

SOLP: Sound data

BOK: Bit clock

WOK1: Word clock

D0 ~ D7

SOLP

SI

DAC IC11

ROUT

A0 ~ A3

KO signal	LSIB
generator	RDAB
LSI17	WRAB
UPD65611GB	RESET

DSP

CCSB LSI11 CRDB HG51B155FD-1

CWRB

RESB

ECEB EOEB EWEB

BOK

WOK1

CLK

LRCK

UPD6376GS

PG

X11

LOUT

CS	OE WE	ED0 ~	EA0 ~
		ED7	EA14
		I/01 ~ I/08	A0 ~ A14

Effect RAM (256K-bit)

LSI13

LC33832M-70-TLM

24.576 MHz

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