Color Graphics Adapter: Difference between revisions

Revision as of 02:44, 15 February 2024

Revision as of 02:05, 31 March 2024

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===Textmode color===

Each character cell stored four bits for foreground and background color. However, in the cardscard's default configuration, the fourth bit of the background color does not set intensity, but sets the blink attribute for the cell. All characters on the screen with this bit set will periodically blink, meaning their foreground color will be changed to their background color so the character becomes invisible. All characters blink in unison.

By setting a hardware register, the blink feature can be disabled, restoring access to high-intensity background colors.