CRT key station which is responsive to centralized control

Details CRT key station which is responsive to centralized control CRT key station which is responsive to centralized control

1974-12-13

1977-08-09

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 302, G06F 304

Patent

active

040414698

ABSTRACT:
Hardware duplication at each of a plurality of CRT key stations is minimized and centralized control is maintained by performing many traditional CRT key station operations under software control by a central processing unit. Simplified CRT key stations include circuitry providing automatic key stroke repeat for continuously actuated keys only after receipt of a repeat enable signal from the central processing unit for each separate repeat and a tone generator responsive to commands from the central processing unit. The tone generator includes a key click circuit to audibly indicate each completion of key activation. CRT key station circuitry inserts a configuration code with each key stroke data word which indicates one of a plurality of available key switch arrangements for the CRT key station. The configuration code permits a single key station hardware design to be included in a data entry system with different keyboard configurations such as typewriter, calculator, keypunch or even foreign language to be selected without need for a conversion system at each CRT key station to convert key stroke information to a common code. Instead, a central processing unit may utilize the configuration code to identify an appropriate conversion table stored in memory.

REFERENCES:
patent: 3308439 (1967-03-01), Tink et al.
patent: 3372381 (1968-03-01), Raspanti
patent: 3436735 (1969-01-01), Hoiseth
patent: 3566365 (1971-02-01), Rawson et al.
patent: 3623013 (1971-11-01), Perkins et al.
patent: 3624645 (1971-09-01), Gluck et al.
patent: 3686639 (1972-08-01), Fletcher et al.

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