Browse Prior Art Database

Graphic Display on a TV Set

IP.com Disclosure Number: IPCOM000086206D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Suding, R: AUTHOR

Abstract

A conventional television set displays symbols under the control of data from a microprocessor.

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Graphic Display on a TV Set

A conventional television set displays symbols under the control of data from a microprocessor.

Numeric, alphabetic, mathematical and other similar symbols are generated from eight-bit data groups supplied by the microprocessor. Each group addresses a previously entered word in random-access memory. A write clock is controlled when data words are initially stored in the memory by the microprocessor. Subsequently, addressed words are removed under read clock control and supplied to a character generator (such as a Motorola MCM6571L), which translates the stored data into signals directing cathode-ray tube electron beam movements corresponding to the desired symbol.

A composite video combines the generator signals with independently generated signals to provide a waveform directly usable by a television set. Nonsymbolic graphic display is obtained by modifying the circuit to receive sixteen-bit data groups and by omitting the character generator. The memory must also be enlarged.

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