Sinclair Cambridge Type 2 (Prototype Model)
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This calculator appears to be a prototype model of the Sinclair Cambridge (type 2) calculator. The calculator casing does not have any model information marked on it, it does not have a battery compartment, and the ICs on the circuit board have no markings.
The Sinclair Cambridge (type 2) has no K (constant) key, but has automatic constant on all functions. Instead it has both C and CE (clear last entry) keys.
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This exhibit has a reference ID of CH70693. Please quote this reference ID in any communication with the Centre for Computing History.