Apparatus for displaying characters

Details Apparatus for displaying characters Apparatus for displaying characters

1980-04-25

1982-04-20

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340750, 340800, G09G 116

Patent

active

043262015

ABSTRACT:
A display system with a single character generator is provided with a CRT controller. A raster address produced from the CRT controller and a raster address inverted by a raster address converting circuit are applied to a multiplexer. The multiplexer is further supplied with the most significant bit of a refresh memory address. Depending on the logical state of the most significant bit, the multiplexer selects the raster address or an inverted raster address outputted from the CRT controller 44 and supplies the selected address to the character generator. Display pattern information outputted from the character generator is applied to a bidirectional shift register. Depending on the logical state of the most significant bit of the refresh memory address, the display pattern information is shifted to the right or to the left. The output of the bidirectional shift register 43 is displayed on the CRT 22 and is supplied to station #1 or station #2 by a mirror reflection.

REFERENCES:
patent: 3696394 (1972-10-01), Kashio
patent: 3777059 (1973-12-01), Wilkey
patent: 3792198 (1974-02-01), Hanson et al.

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