Data processing device having memory selectively interfacing wit

Details Data processing device having memory selectively interfacing wit Data processing device having memory selectively interfacing wit

1983-12-16

1987-03-31

Williams, Jr., Archie E.

Boots, shoes, and leggings

364419, 364704, G06F 1300, G06F 1516, G06F 1520

Patent

active

046548181

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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Electronics Review, Hand-held Terminal to Give Held Troops Access to Data Nets, (Electronics, Nov. 11, 1976) pp. 29-30.

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