Method and apparatus for accessing a color palette synchronously during refreshing of a monitor and asynchronously during updating of the palette

摘要

A method and apparatus for accessing a color palette in a color graphics system synchronously and asynchronously. Address and data registers coupled to the color palette are operated synchronously in a pipeline fashion using clock pulses having a pixel scanning rate when the palette is used for refreshing a color monitor. The address and data registers are operated asynchronously, i.e. rendered transparent to addresses and data, respectively, when the palette is updated by a CPU.