Casio CTK-650 - Block Diagram

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BLOCK DIAGRAM
Keyboard
KC0~KC7
SI0~SI7
FI0~FI7
Key Touch
LSI
HG52E35P
D0~D7
RAM-1(64K)
MN4464-08L-1
CPU
HD6433298A16P
(H8/329)
7-Segment
LED
LO0~LO4
LED driver
BA612
La
~Lp
KO0~KO5
Buttons
KI1~KI7
100K
VDD
Power Switch
MIDI
INOUT
RAM-2(64K)
MN4464-08L-2
EA0~EA12
ED0~ED7
LSI-S
HG51A115A01FD
RA0~RA19
RD0~RD15
ROM(16M)
TC5316200CP-C079
WCK1 SLOP BCK
D/A Converter
µPD6376CX
Filter
Filter
Main
Volume
Power Amplifier
LA4598
Output
Speakers
Address Bus
KO0~4