commodore 784D


Brand: commodore
Model: 784D
Type: Calculator
Picture: commodore 784d
Batteries: 9V x 1
Lifetime: Introduced: ca. 1975
Terminated: unknown
Notes: Basic function calculator with one peculiarity. On the back of the calculator it reads "Unsnap and remove battery before plugging in AC adapter". Apparently the battery circuit is such that the AC adapter's power is fed to the battery when plugged in. This would probably blow up the battery if left inside.


A power adapter.