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Calculator CPU ICs: HD38411A
 
Hitachi HD38411A Calculator IC
ID: HD38411A Used in: Toshiba BC-1027
Type: Calculator IC, 10+1 digit, switched constant, %, add-on (discount), square root, overflow recovery, sum of individual products/quotients, (switched) sum of individual totals and differences, mark-up/down, four function memory, switched floating/fixed modes, rounding modes.
Maker: Hitachi
Typical date range: Early 1980s
Package: 36 pin DIL (aka USA DIP) 0 black plastic
Date coding system: TBD
Notes: Designed for desktop financial calculators, drives VFD direct

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

Pins
D1-D13: Keyboard/display matrix
K1-K4: Keyboard Matrix
SA-SG and SDP - display segments
COMMA1/2: display control (for thousands indication)
L1 - rounding/constant/sigma switch
SYN/R: looks like on-board oscillator
CP: unknown

Voltages are given for this example respective to GND
VDD  -9.5V
VGG -9V
VDISP -30V

Notes: Lacks input overflow suppression but has overflow recovery
Looks like it may be capable of driving 12+1 digits? (or D12 does not drive the display and D13 only drives a minus sign)
Any more info would be a help.