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Busicom 812 (Colex)

The Busicom 812 is an arithmetic calculator with 8 digits precision and algebraic logic. It has a VFD (vacuum fluorescent) display. The power source is 4xAA. Note: Made by Colex.

Facts at a glance:

Display typeVFD
Power Source4xAA
Year introduced1975
Year discontinued1975


If you have a Busicom 812 that is no longer working, you can first try replacing the 4xAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by Busicom