Sinclair Cambridge Memory (Type 3)

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The Sinclair Cambridge series of calculators was introduced in Summer 1973, and was the second calculator from Sinclair Radionics after the Executive was released in 1972. On release the Executive was the world's slimmest calculator, measuring a third of the size of other calculators available at the time. The Sinclair Cambridge was another small-sized range of calculators, and truly pocket-sized.

There was a number of different models in the Cambridge range. This example in our collection is the Memory model, and is believed to be the third variation out of three known variations which dates from around 1976. It is a four-function calculator with additional % and memory features. It featured the Mostek MK-50321 integrated circuit.

The Sinclair Cambridge Memory Types 2 and 3 differed from the Type 1 as they included a % key. The Type 3 also differed in that it had 'M' and 'C/CE' keys, and it was powered by a PPP3 battery compared to the 4 AAAs in the Type 1 and two AAAs in the Type 2. Due to the PPP3 battery, the Type 3 was one of the bulging "pregnant" models. It had a red plastic case with white keys, and an eight-digit Bowmar LED display.

This calculator was very kindly donated by Francis Hookham.

Manufacturer: Sinclair
Date: 1975

Other Systems Related To Sinclair Cambridge Memory (Type 3):

Item Manufacturer Date
Sinclair Cambridge Universal Sinclair Unknown
Sinclair Executive Type 2 Sinclair Radionics 1972
Sinclair Executive Type 1 Circuit Board Sinclair Radionics 1972
Sinclair Executive Type 1 Sinclair Radionics 1972
Sinclair Cambridge Type 2 (Prototype Model) Sinclair 1973
Sinclair Executive Memory (Possible Development Model) Sinclair Radionics 1973
Sinclair Executive Memory (Development Model) Sinclair Radionics 1973
Sinclair Executive Memory Sinclair 1973
Sinclair Cambridge (Type 1) Sinclair Radionics July 1973
Sinclair Cambridge Memory (Type 2) Sinclair 1975
Sinclair Oxford 100 (Type 1) Sinclair Radionics 1975
Sinclair Cambridge (Type 3) Sinclair Radionics 1975
Sinclair Scientific Programmable Calculator Sinclair Radionics 1975
Sinclair Oxford 200 (Type 1) Sinclair Radionics 1975
Sinclair Oxford 200 (Type 2) Sinclair Radionics 1975
Sinclair Oxford 200 (Type 1 - Early Style) Sinclair Radionics 1975
Sinclair Oxford Universal Sinclair Radionics 1975
Sinclair Oxford 300 (Type 2) Sinclair Radionics 1975
Sinclair Cambridge (Type 4) Sinclair Radionics 1975
Sinclair Sovereign (Gold) Sinclair Radionics 1976
Sinclair Enterprise (Early Prototype Model) Sinclair Radionics 1976
Sinclair Oxford Scientific Calculator Sinclair 1976
Sinclair Sovereign (Black) Sinclair Radionics 1976
Sinclair Cambridge Scientific Calculator Sinclair Radionics 1976
Sinclair Enterprise (Possible Prototype Model) Sinclair Radionics 1977
Sinclair Sovereign (Silver Jubilee) Sinclair Radionics 1977
Sinclair Cambridge Programmable Sinclair 1977
Sinclair Cambridge Programmable Sinclair 1977
Sinclair Instrument Wrist Calculator Sinclair Instrument February 1977
Sinclair President Scientific Sinclair 1978
Sinclair President Sinclair 1978
Sinclair Sporting Life Settler Sinclair 1978
Sinclair Enterprise Programmable Sinclair Radionics 1978
Sinclair President (Boxed Version) Sinclair 1978

This exhibit has a reference ID of CH30323. Please quote this reference ID in any communication with the Centre for Computing History.

 

Sinclair Cambridge Memory (Type 3)


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