Synchronous clear for CRT memory buffer

Details Synchronous clear for CRT memory buffer Synchronous clear for CRT memory buffer

1994-02-24

1995-06-20

Brier, Jeffery

Computer graphics processing and selective visual display system

Data responsive crt display control

Combined with storage means

345200, G09G 102

Patent

active

054264456

ABSTRACT:
A system that clears a portion of a graphics display in synchronization with an electron beam scanning the face of the graphics display. When a clear operation for a window on the graphics display screen is received, the system compares the location of the beam with the window and determines whether an interference would occur if the window is cleared immediately. If no interference would occur, the window clear operation is immediately started. If an interference would occur, the system waits until the electron beam has scanned beyond the top of the window before starting the clear operation. Then, before clearing each scan line, the system waits until the beam has already scanned past the scan line being cleared.

REFERENCES:
patent: 4511965 (1985-04-01), Rajaram
patent: 4782462 (1988-11-01), Kaplinsky
patent: 4868556 (1989-09-01), Murakami et al.

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