Addo-X 9958 Desktop Calculator
Image Courtesy Andreas Zinn
Early bipolar (TTL) IC and transistor hybrid calculator. Marketed by
Swedish company Addo-X (A.B. Addo) under OEM agreement with Sharp. A few early
small-scale integrated circuits are used, along with a vast majority of
discrete transistor and diode-resistor logic circuitry. 16-digit capacity,
two independent accumulator-type memory registers. Fixed decimal with
knob-selectable settings of 0, 2, 3, 4, or 8 digits behind the decimal.
Provides square root function by pressing
"÷" key followed by "=" key. Virtually
identical other than color scheme and subtle cabinetry variations to
the Burroughs C-3350 calculator, also OEM'd by Burroughs from Sharp.
Visit the Old Calculator Web Museum exhibit on the
Burroughs C-3350 for more
information about a similar design calculator marketed by Burroughs.
Addo-X 9958 Specifications
||Japan (by Sharp for Addo-X)
||Nixie Tube, 16 Digits
||Mix of early bipolar small-scale IC's and discrete diode/transistor logic
||Small magnetic core memory array for working register storage
|Digits of Capacity:
||Fixed at rotary switch-selectable locations, automatic round-off
||Four Function plus two-key Square Root
||Two accumulator-style memory registers
||Approx. 12 1/4" wide, 16" deep, 4 1/2" high
||Approx. 14.5 pounds
Copyright ©1997-2021, Rick Bensene.