Graphic display apparatus with combined bit buffer and character

Details Graphic display apparatus with combined bit buffer and character Graphic display apparatus with combined bit buffer and character

1988-07-07

1990-03-20

Oberley, Alvin

Communications: electrical

Land vehicle alarms or indicators

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

340747, 340799, G06F 1300

Patent

active

049105051

ABSTRACT:
A graphics display apparatus with a combined bit buffer and character graphics store includes a coded display buffer containing pointers to the store. The store is constituted by odd and even memories used to derive bit patterns for odd and even character cell columns on the display and is partitioned into a font area and a bit buffer area. In a first mode of operation, compatible with existing programmed symbol arrangements, pointers in the coded display buffer in conjunction with odd/even select signals and slice signals derive the bit patterns for each raster scan line of the display. In a second mode of operation, a graphic image to be displayed is stored as a bit map in the bit buffer area: the required bit pattern is derived using slice and odd/even select signals in conjunction with pointers stored in the coded display buffer.

REFERENCES:
patent: 3821730 (1974-06-01), Carey et al.
patent: 4094000 (1978-06-01), Bradevold
patent: 4245308 (1981-01-01), Hirschman et al.
patent: 4278973 (1981-07-01), Hughes et al.
patent: 4298931 (1981-11-01), Tachiuchi et al.
patent: 4308532 (1981-12-01), Murphy
patent: 4667190 (1987-05-01), Fant
patent: 4686521 (1987-08-01), Beaven

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