Variable loadable character generator

Details Variable loadable character generator Variable loadable character generator

1987-01-05

1987-10-27

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340802, 340801, 340703, 340723, G09G 116

Patent

active

047033223

ABSTRACT:
A Loadable Character Generator whose operation can be changed to suit various needs, such as foreign language requirements, without hardware change and with minimum hardware. The character generator translates the character code of a character to be displayed to the dot pattern for that particular character, utilizing a minimum of hardware. The loadable character generator of the invention replaces the ROM/PROM by a RAM utilizing 2K and 8 RAM memories, a 4K by 8 memory, 4 MUX chips, and a Motorola 6845 CRT Controller with various registers and is loaded through the attribute buffer.

REFERENCES:
patent: 2920312 (1960-01-01), Gordon
patent: 3422420 (1969-01-01), Clark
patent: 3631455 (1971-12-01), Gregg, Jr.
patent: 3729730 (1973-04-01), Sevilla et al.
patent: 4258361 (1981-03-01), Hydes et al.
patent: 4375079 (1983-02-01), Ricketts et al.
patent: 4439761 (1984-03-01), Fleming et al.

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