Terminated: unknown
It runs on a 9V battery. The battery case is at the top, and the rest of the calculator has a wedge form, so when it is on a desk it is slightly tilted.
This calculator does not have a decimal point key. It is actually quite hard to work with. I couldn’t find a manual but it is almost RPN like. The only way I could for instance multiply two numbers, say 1 and 2 is by first entering the number 1, press the "+=" key, enter 2 and press the "×="-key. So, to perform a series of calculations, enter the first number, press the "+=" key followed by the next number, followed by the requested operation and so on. To start a new sequence, first press the "C"-key.
Not only does this calculator not have a decimal point key, it does not like fractions at all. When dividing numbers, the results are displayed as integer results. For instance, 8 divided by 3 yields 2.
The power button (slider) is at the top of the calculator and has three positions. "OFF", "ON" and "$". When set to the last one the calculator enters monetary mode. The decimal point is fixed and lights up after the third digit from the right. To enter the number "1" one now has to press the "1"-key followed by pressing the "0"-key twice. In this mode it does present fractional results (2 decimals).
The buttons on this particular specimen are very bouncy making the calculator almost impossible to use. I’m not sure if this is model-specific.
Many thanks to Richard Pilkington of the University of Salford for donating this peculiar calculator to the museum.