Casio CE-250

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3-2. BLOCK DIAGRAM
CPU
uPD78052GC-093-3B9
Head Drive Circuit
Reset Circuit
Keynoard
Mode key
Power Supply Circuit
HA.A ~ HD.H
PRINTER
M-190G
DISPLAY CONTROL
uPD16312GB-3B4
CUSTOMER DISPLAY
SH1019A
MAIN DISPLAY
SH101MA
DI,DO,CLK,STB
Segment & Digit data
A8 ~ A15
KC0 ~ KC4
Select address
AD0 ~ AD7
AD0 ~ AD5
AD0 ~ AD7
AD0 ~ AD7
ROM
RAM
A8 ~ A11
A8 ~ A15
A0 ~ A7
A0 ~ A7
ASTB
enable
BUS Select Circuit
KEY Circuit
FD,RP,MD,DP
MAIN PCB E248-1