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The SGI Visual Workstations (models 320 and 540) are based aroundthe Cobalt, Lithium, and Arsenic ASICs. The Cobalt ASIC is themain system ASIC which interfaces the 1-4 IA32 cpus, the memorysystem, and the I/O system in the Lithium ASIC. The Cobalt ASICalso contains the 3D gfx rendering engine which renders to mainsystem memory -- part of which is used as the frame buffer whichis DMA'ed to a video connector using the Arsenic ASIC. A PIIX4chip and NS87307 are used to provide legacy device support (IDE,serial, floppy, and parallel).The Visual Workstation chipset largely conforms to the PC architecturewith some notable exceptions such as interrupt handling.