Plural video keyboard access system

Details Plural video keyboard access system Plural video keyboard access system

1981-04-14

1983-09-13

Masinick, Michael A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

364146, 364189, G06F 314

Patent

active

044045514

ABSTRACT:
A video communication network (20) capable of providing a plurality of simultaneous textual data video frames to a plurality of keystations (22, 24) from a plurality of computer systems comprising at least two different data bases having incompatible keyboard protocols or character codes (40, 47, 46a, 46b) employs a single keyboard (28, 38) at the keystation (22, 24) to both selectively communicate with various different data base computer systems (40, 47, 46a, 46b) and enable keyboard generated dynamic selection of a textual data video display from a multiplexed plurality of simultaneously provided composite video signals corresponding to the plurality of video frames. Each keyboard (28, 38) may control anywhere from one VDU (26) up to four such VDUs (30, 32, 34, 36), by way of example. The keyboard (28, 38) is connected to a keyboard display driver (42a, 42b) which interfaces the keyboard (28, 38) to the various computer systems (40, 47, 46a, 46b), such as host and subscriber computer systems, and to a video matrix switch (44a, 44b). A keyboard code converter (48a, 48b) is connected between the keyboard display driver (42a, 42b) and an incompatible computer system (40) for converting incompatible keyboard character codes from the keyboard (28, 38) into codes compatible with the subscriber system (40) with no such conversion being required, for example, for the host computer system.

REFERENCES:
patent: 3903402 (1975-09-01), Petit
patent: 3909818 (1975-09-01), Dalke
patent: 4001807 (1977-01-01), Dallimonti
patent: 4122519 (1978-10-01), Bielawski
patent: 4143360 (1979-03-01), Bernhart
patent: 4191956 (1980-03-01), Groothuis
Reuters Monitor System, Jan. 1981.
Avitel 3000 Series, Video 8x1 Switch, USW 3077, Avitel Electronics Limited, Aug. 1980.

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