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Calculator CPU ICs: HD38401

 
Hitachi HD38401 Calculator IC
ID: HD38401 (poss suffixed A) Used in: Sharp EL--2121
Type: Calculator IC, 12+1 digit, constant multiplication and division, Add mode in addition and subtraction, square, chain, power, %, reciprocal, add-on (discount), square root, mark-up, four function memory, switched floating/fixed modes, rounding modes. Casio S-1
Maker: Hitachi
Typical date range: Mid 1980s
Package: 36 pin DIL (aka USA DIP) 0.6" width black plastic
Date coding system: {year}{month} {lot?}
Notes: Designed for desktop financial calculators, Casio S-1 has more functions than the sharp

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

Pins
W1-W13: Keyboard matrix
K1-K4: Keyboard Matrix
a-g and DP - display segments
COM1: display control
L1 - rounding switch
SYN: looks like on-board oscillator

Voltages are given for this example respective to GND
VDD  -4.05 to -4.95V
VGG -8.10 to -9.90V
VN -21.6 to -21.4V
VNG -32.4 to 89.6V!

Notes: Lacks input overflow suppression