Sinclair Scientific programmable Calculator Type 2 design

Released 1975
9V Alkaline battery or mains adaptor
9 digit 7-segment green vacuum fluorescent display
5 digit precision
Reverse polish data entry
Sine, cosine, arc-tangent, antilog, log, reciprocal, square and square root
73 x 155 x 34 mm (2.9 x 6.1 x 1.4 ins).
Made in England

"This is a very basic programmable calculator with many shortcomings.  Although there is a 9 digit display, the precision is limited to 5 digits because 3 are reserved for the exponent.  There is no "power of" function.  The reverse polish entry is limited by a two level stack, which is destroyed whenever a scientific function is used.  The programming model is wasteful, for example constants require a start and end quote.  Constants in programs must be integers."


Manufacturer: Sinclair
Date: 1975

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This exhibit has a reference ID of CH31308. Please quote this reference ID in any communication with the Centre for Computing History.

 

Sinclair Scientific programmable Calculator Type 2 design


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