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Calculator CPU ICs: uPD1801C (µPD1801C)
 
NEC uPD1801C Calculator IC
ID: uPD1801C Used in: Adler EC8s
Type: Calculator IC, four function, 8+1 digit, square root, change sign, Pi, percentages, switch floating/fixed modes, auto constant on multiply and divide
Maker: NEC
Typical date range: Mid to late 1970s
Package: 28 pin DIL 0.6" width black plastic
Date coding system: Unknown
Notes:

Pin-outs and near example circuitry is shown for your information.

Pins
1: T1(invert): test pin
2-10: D1-D9: display grids
11-13: K1-K3: keyboard matrix
14: GND
15: T2(invert): test pin
16: DP: decimal point
17: Sx: keyboard matrix
18-24: SG-SA: segment control and keyboard matrix
25: T3: segment control
26: VDD
27: VCC
28 CG: Clock

Voltages are given for this example
VDD  
VCC 
GND 0V