APF MARK 23 (Electronic Slide Rule Calculator)
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 |
| Year discontinued | 1975 |
Replacements:
If you have an APF MARK 23 that is no longer working, you can consider replacing the calculator with a modern equivalent.
We suggest the following current models as possible replacements: