Shared graphics memory: Difference between revisions

Revision as of 20:39, 8 August 2009

Revision as of 20:41, 8 August 2009

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The first PC to use the SMA was the [[IBM PCjr]], released in 1984. [[Video memory]] was shared with the first 128K of RAM. The exact size of the video memory could be reconfigured by software to meet the needs of the current program.

Another early design was the [[Commodore International|Commodore]] [[Amiga]], introduced in 1985. It initially featured 256-2048 [[KiB]] of "[[chip RAM]]" (later up to 2048 KiB, depending on the model). This RAM was used by both the CPU (as main memory) and the Amiga's [[Original Amiga chipset|custom chipset]] (for sound/graphics/IO). By default, most Amiga computers camewere shipped with chip RAM only, but could be expanded with RAM that only the CPU could access (called "Fast RAM"), through expansion boards.

== See also ==