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Calculators

This model came in 4 incarnations -

Most

The Type 1 and Type 3 had K (constant) keys.

Type 2 had C and CE keys.

Type 4 had % key. It is also the rarest of the Cambridge range, presumably because by 1977 ,the design was 4 years old and LCD calculators from Japan were becming available and so relatively few were sold.

All came in a polystyrene-

These explained how to do constant arithmetic and reciprocals, and had examples of how to perform currency conversions, mortgage interest repayment, and compound interest.

Cambridge Type 1 model

Cambridge type 1 box

Cambridge display was 8 digit red LED

Type 2 model in brown plastic case.

Type 2 model

Type 3 model and box

Type 4 model

The Type 4 model was distinguished by having a % function!

**Cambridge Memory**

This model came in three variations -

The Type 1 took 4 x AAA batteries, had 4 functions and an RM/CM key (one press recalled from memory, two presses cleared the memory).

The Type 2 took 2 x AAA batteries, and in addition to the Type 1 abilities, had a % key.

The Type 3 took a 9V PP3 battery, and had M, C/CE and % keys. The rear of the case had to have a bulge to accommodate the large battery.

Cambridge Memory Type 1

Type 1 distinguished by it's blue number keys and power button.

Memory Type 2 model and box

Memory Type 2 had a silver finish.

Memory Type 2

Memory Type 3 model, from around 1976, distinguished by unusual orange case!

**Cambridge Scientific**

Launced in March 1974 at a cost of £49.95, it was a development of the Cambridge with the same case but the addition of some scientific functions such as logarithms, trig, square root and pi.

Took 2 X AAA batteries and there was a switch to select degrees or radians inside the battery compartment.

Display was exponent format.

**Cambridge Programmable**

On 1st September 1976, the Cambridge Programmable was released (marketed in the United Sates as the Radio Shack EC-

It had an 18 byte memory allowing a 36-

It took the larger 9V PP9 battery which resulted in the bulge at the rear (below).

Bulge to accommodate PP3 battery.

Presentation box and manual.

**Cambridge Universal**

4-

Also had the bulge at the rear to accomodate the 9V battery.