Specifications

CHAPTER 2
Hardware Design
Hardware Overview 11
■ The PC chip set, which provides a controller for memory, for the PCI bus, and for the
ISA bus.
the 12” card uses the Opti chip set composed of the 82C556, 82C557, and
82C558 ICs.
the 7" card uses the Sis 486-SIS chip set composed of the 85C496 and 85C497 ICs.
■ The ATI 264CT integrated VGA (video graphics adapter) graphics accelerator IC with
a built in color lookup table (CLUT) for video output. This IC supports the PCI bus
I/O, and a variety of memory types and sizes, screen resolutions, and color depths.
■ The Creative Technologies Vibra 16S 16-bit audio IC and the Yamaha OPL3 FM
synthesizer chip set, which provide audio output compatible with the Sound
Blaster Pro products.
Figure 2-1 12” card with featured ICs
Note
Card dimensions are shown in Figure 1-2 and Figure 1-3 on page 4.
Connectors are shown in Figure 3-1 on page 34 and Figure 3-2 on
page 35.
◆
Side A
Side B
Slot for DIMM
Onboard DRAM
Video RAM
Audio IC
PCI bridge ASIC
Yamaha OPL3
FM synthesizer
ATI
264CT
82C558
82C556
Vibra
16S
82C557
Pentium-
class
processor
Sockets
for VRAM
VGA controller
PCI edge connector
PCI edge connector
Note: PCI edge connector is shown to define orientation.
Part of
PC chip set
Part of PC chip set
Cache