Data processing device having memory selectively interfacing with computer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 31, 1987
Grant Date -
N/A
app pub date -
Dec 16, 1983
filing date -
Dec 16, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A portable educational device that is adapted to be used in conjunction with a counter (12) having a display (14) and a keyboard (16) for input of data. A memory slot (18) or an alternate port (19) is provided on the computer (12) to receive the educational device (20). Educational device (20) contains a keypad (24) and a display (26) and operates independent of the computer (12). The educational device (20) includes a central processing unit (48), a Read Only Memory (42) and a Random Access Memory (44). A primary power source (54) supplies power to the educational device (20) during the operation thereof. A back-up power source (56) provides power to the Random Access Memory (44) to form a non-volatile memory for retention of data during periods of non-use. A connector (34) interfaces with the computer (12) to allow the computer (12) to address the Random Access Memory (44) to retrieve data stored therein and to store data at selected locations therein for use by the Central Processing Unit.
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Cited Art Landscape
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