Vintage British Calculators

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Memory Devices

Memory Devices Ltd., based at Central Avenue, East Molesey, Surrey, was a subsidiary of Analog Devices Inc. of the U.S.A., and was subsequently absorbed into the parent company.

Two calculator models from Memory Devices are known:

Memory Devices MEMORY 808MD

Memory Devices 808MD

Display is 8 digits, green fluorescent in a single tube.

4-functions, %, memory, square root.

4.8v (4 x N rechargeable cells).

Integrated Circuit - Rockwell A1241PA (date coded 7425).

83 x 143 x 21 mm (3.25" x 5.7" x 0.8").

Manufacturer not known.

Inside

Memory Devices MEMORY ESR-817

Memory Devices ESR-817

Display is 8 digits, green fluorescent in a single tube.

Scientific ("Electronic Slide Rule").

4.8v (4 x N rechargeable cells).

Integrated Circuit - Rockwell A4001PC (date coded 7538).

83 x 143 x 21 mm (3.25" x 5.7" x 0.8").

Introduced 1974, price 52-90 (about $122).

Made under sub-contract by ITT Components Group Europe.

Inside Memory Devices ESR-817

Vintage British Calculators

© Text & photographs copyright Nigel Tout   2000-2021  except where noted otherwise.