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Calculator CPU ICs: M58344P

 
Mitsubishi M58344P Calculator IC
ID: M58344P Used in: Sanyo CY3421DP
Type: Calculator IC, four function, 12+1 digit, four function memory, switch floating/fixed modes, printer, auto constant, percentages (including delta, MU and MD), power, reciprocal, counter, average, group total.
Maker: Mitsubishi
Typical date range: 1980s
Package: 42 pin DIL 0.3" width black plastic
Date coding system: Unknown
Notes: Drives VFD direct but required buffers for printer driving

Pin-outs are shown for your information.

Pins
G2-G6 and G7-G10: display grids and keyboard matrix
K0 to K3: keyboard matrix
PO: paper feed and display comma
P1: red ribbon change signal
P3: printer column and display decimal point
P4-P6, P8-P9, P11-P12: printer columns and display segments
P7,P10,P13,P16,P19,P20: printer column
P14-P15. P17-P18: printer columns and display grids
VC (or CGin): Clock frequency
MT: Motor control signal
TP: Printer timing
MS1-MS2: Mode switches (rounding and fixed decimal)

Voltages are given for this example
V
LL  -29V
V
GG -15V
GND 0V