Setting display according to view angle of user by altering brightness values of colors stored in palette registers when user presses buttons indicating change of angle of view

摘要

Brightness values for display colors are stored in palette registers in e.g. video control. Button (12) is pressed to increase angle index, which then increases brightness and reduces contrast range of image on display. Button (13) is used to decrease angle index which decreases brightness and increases contrast. Display CPU monitors buttons to determine if angle index is altered and call routine to alter color palette.