Character and graphic signal generating apparatus

Details Character and graphic signal generating apparatus Character and graphic signal generating apparatus

1983-09-22

1986-05-27

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340747, 340748, 340750, G09G 116

Patent

active

045918457

ABSTRACT:
A character and graphic signal generating apparatus of the type suitable for use with a personal computer for displaying characters and graphic patterns in a superposed relation according to a raster scan method comprises a frame buffer for storing coded character data, a DMA control unit for controlling DMA transfer of coded character data from a display RAM to the frame buffer in a non-display cycle, and units for reading out the data from the display RAM and the frame buffer in parallel relation in a display cycle so as to simultaneously derive the graphic data and the coded character data in each display cycle, whereby more display data can be read out in a unit time, and high-density display can be achieved without the sacrifice of the scanning speed.

REFERENCES:
patent: 4394650 (1983-07-01), Long et al.
patent: 4404552 (1983-09-01), Hirahata et al.
patent: 4445115 (1984-04-01), Rudgard
patent: 4450442 (1984-05-01), Tanaka
patent: 4470042 (1984-09-01), Barnich et al.
patent: 4486746 (1984-12-01), Walker
patent: 4490797 (1984-12-01), Staggs et al.
patent: 4498081 (1985-02-01), Fukushina et al.
patent: 4504826 (1985-03-01), Leininger

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