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Sinclair Executive Memory
Display is 8 digits, red LED.
4-function, memory.
3.9v (3x button cells).
56 mm x 138 mm x 9 mm (2.2" x 5.5" x 0.4").
Introduced 1973.
Made in England
The incredibly small thickness for this stage in calculator development was attained by using button cells as the power source.
The low power consumption needed to employ button cells with their low capcity was attained by
pulsing the electronics - not recommended by the manufacturer, but it worked.
The keypad uses a very thin plastic membrane moulding to keep the thickness down. The actual keys are the tiny buttons in the centre of each pad
area.
The white and black (type 1) version is more common than the version with the gold keyboard (type 2).
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