Video apparatus employing vrams

Details Video apparatus employing vrams Video apparatus employing vrams

Category

G - Physics

Subcategory

09

Subsubcategory

G

CPC

354/236, 375/53

IPC codes

G09G 5/00 (2006.01) G06F 3/153 (2006.01) G09G 5/39 (2006.01)

Type

Patent

Patent number

CA 1301972

Description

ABSTRACT OF THE DISCLOSURE A video card using VRAMs for a computer which includes a CPU and main memory. The VRAM addresses are generated in a manner making it unnecessary to have an integer number of scan lines per memory row. A counter keeps track of the shift register position in the VRAMs and a new row address is generated in hardware independent of the scan line. A look-ahead feature detects the approaching end of the shift register data and initiates a timing sequence to reload the shift register.

Application Number

561548

Affiliated with

Also associated with

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