APF MARK 23 (Electronic Slide Rule Calculator)

APF MARK 23
Image: Joe Haupt, CC BY-SA 2.0
The APF MARK 23 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 9 functions, 20 keys, and a VFD (vacuum fluorescent) display. The power source is Sealed battery pack. The calculator was manufactured in Japan.

Facts at a glance:

Feature Value
Type: Arithmetic
Functions: 9
Keys: 20
Precision: 8
Logic: Algebraic
Display type: VFD
Length: 159mm
Width: 76mm
Power Source: Sealed battery pack
Country: Japan
Year introduced: 1974
YearDiscontinued: 1975

See other calculators by APF