Programmable pixel and scan-line offsets for a hardware cursor

Details Programmable pixel and scan-line offsets for a hardware cursor Programmable pixel and scan-line offsets for a hardware cursor

1993-04-29

1994-11-01

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345157, G09G 302

Patent

active

053610814

ABSTRACT:
An apparatus and method for positioning a cursor on a video display having a horizontal blank time and a vertical blank time, where the cursor is addressed by a match position representing the cursor hot point relative to the origin of a pixel matrix, including cursor position registers for providing (x,y) cursor positioning coordinates; adders for adding to the (x,y) coordinates values representing the horizontal and vertical blank times respectively; and subtracting circuits for subtracting from the result values representing the horizontal and vertical match positions to provide the actual screen position at which the cursor is displayed. Accordingly, partial blanking and variable cursor hot points are supported in a manner transparent to the cursor positioning software.

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