Modular calculator with separable keyboard and display modules
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United States of America Patent
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Apr 5, 1983
Grant Date -
N/A
app pub date -
May 30, 1980
filing date -
May 30, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A modular calculator system using interchangeable input modules and output modules provides several different calculators using the same output display components to avoid expensive duplication of parts. The input module contains the calculator keyboard and program-control circuits which establish predetermined calculator functional capabilities, such as basic arithmetic or scientific functions. The output module houses and drives a printer and visual display components. Data from the input module is communicated serially over a single line to the output module so that a single reliable and inexpensive electrical connection may be used. An overlapping flange mechanical coupling physically connects the modules to form a combined unitary calculator housing.
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