Display control apparatus employing bit map method

Details Display control apparatus employing bit map method Display control apparatus employing bit map method

1986-11-07

1989-06-06

Yusko, Donald J.

Communications: electrical

Land vehicle alarms or indicators

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

340748, 340799, G09G 316

Patent

active

048375640

ABSTRACT:
A display control apparatus using a bit map method, for controlling character attribute data, such as an underline and an overline. In the apparatus, a line control memory is arranged to preset information of character attributes in units of lines of character fonts to be transferred to a video memory; in a DMA transfer sequence of a DMA transfer controller. Character attribute control is performed in a character controller for each line transfer according to the attribute information read out from the line control memory, and expansion of a character font from a character font memory area to the video memory can be simultaneously performed with processing of character attributes from the line control memory.

REFERENCES:
patent: 4418344 (1983-11-01), Brown
patent: 4504828 (1985-03-01), Cooper et al.
patent: 4646077 (1987-02-01), Culley
patent: 4646261 (1987-02-01), Ng
patent: 4680578 (1987-07-01), Hornig et al.

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