Terminated: unknown
Errors are indicated by the abcense of the decimal point. Negative numbers are indicated using a red LED at the bottom right of the display.
The power switch on the left side of the calculator has three positions. Up for on, middle for off, and down for charging NiCad batteries. There is a warning at the back to not use this position when non-rechargeable batteries are installed (you probably won’t like the result if you do).