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Other approach that gave similar final state is boost up of graphics, that is used in some [[Silicon Graphics|SGi]] computers, most notably [[SGI O2|O2/O2+]]. The memory in these machines is simply one fast pool (2,1 GB/s per second in 1996) shared between system and graphics is done on demand including pointer redirection communication between main system and graphics subsystem. This is called Unified Memory Architecture (UMA).
== History ==
Most early personal computers used a shared memory design with graphics hardware sharing memory with the CPU. Such designs saved money as a single bank of DRAM could be used for both display and program. Examples of this include the Apple II computer, the Commodore 64, the Radio Shack Color Computer, the Atari ST, and the Apple Macintosh.
A notable exception was the IBM PC. Graphics display was facilitated by the use of an expansion card with its own memory plugged into an ISA slot.
The first IBM PC to use the SMA was the [[IBM PCjr]], released in 1984. [[Video memory]] was shared with the first 128KiB of RAM. The exact size of the video memory could be reconfigured by software to meet the needs of the current program.
An early hybrid system was the Commodore Amiga which could run as a shared memory system, but would load executable code preferentially into non-shared "fast ram" if it was available.
== See also ==
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