Communications: electrical – Systems – With specific power supply
Patent
1975-06-10
1978-01-10
Trafton, David L.
Communications: electrical
Systems
With specific power supply
340337, 340365E, G06K 1518
Patent
active
040682269
ABSTRACT:
Data entered at a matrix keyboard or from a remote computer is loaded into a display buffer area of a random access storage device. Data is displayed by sequentially refreshing a plurality of display elements from a one character display buffer, loaded from the storage device under control of a display address counter. Data storage and data retrieval for display is multiplexed, with data retrieval being synchronous with respect to a system clock, and data loading being asynchronous from the keyboard. A control counter, synchronously driven by the system clock, is decoded to scan the keyboard for data entry and to gate the one character display buffer to the next sequential display element to be refreshed. Initial correspondence between the display gating and the display address counter is established, which correspondence is asynchronously stepped by entry of another character from the keyboard, so that the most recently entered character appears at the rightmost position of the display.
REFERENCES:
patent: 3340524 (1967-09-01), Rinaldi
patent: 3617711 (1971-11-01), Smyth
patent: 3755806 (1973-08-01), Bunting
patent: 3834616 (1974-09-01), Washizuka et al.
patent: 3902054 (1975-08-01), Cochran et al.
patent: 3911424 (1975-10-01), Giannuzzi et al.
patent: 3920926 (1975-11-01), Lenaerts et al.
Bowman Robert A.
Burd Mark M.
Beckstrand Shelley M.
International Business Machines - Corporation
Trafton David L.
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