Casio DL-270B - Block Diagram

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Display tube
SC131MH
CPU
MN158418YCY
Power supply
circuit
Slide switch
Keyboard
Printer
M-80
VF1, VF2
Ribbon shift signal
Character selective signal
Timing pulse
Digital signal
D1 ~ D13
Motor control signal
Motor power supply
Detector power supply
VDD
GND
VSS
Segment signal
S1 ~ S7, SAP, SDP
SO1 ~ SO7
SI1 ~ SI3, SI5
KO1 ~ KO8
KI1 ~ KI6
2. BLOCK DIAGRAM