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Calculator CPU ICs: M58347P

 
Mitsubishi M58893P Calculator IC
ID: M58893P Used in: Canon P2-D
Type: Calculator IC, four function, 10+1 digit, four function memory, switch floating/fixed modes, square root, percentages, total, printer
Maker: Mitsubishi
Typical date range: Mid to late 1980s
Package: 40 pin DIL 0.6" width black plastic
Date coding system: Unknown
Notes:

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

Pins
Sa-Sg and SDp : display segments and decimal point
D0 to D10: display grid signal for each digit, and keyboard multiplexing
K0 to K3 and K0' and K3': keyboard and switch multiplex lines
TP, TM, S', TR and MT are printer controls
VC: onboard clock
ACL looks like a clear on power up automatic clear

Voltages are given for this example
V
24.3 to 29.7V
V
GG -11.7 to 14.3V
V
ss 0V