User`s manual

Pentium

OverDrive Ready System Board

The 486-OCV Plus uses 256Kx36, 512Kx36, 1Mx36,

2Mx36, 4Mx36 and 8Mx36 HSIM modules with speeds

of at least 80ns. The memory can be configured to

twenty-one different sizes from 1MB to 64MB. The

system is equipped with two 32-bit VESA VL-Bus and

eight 16-bit ISA expansion slots.

Features and Specifications

• Intel 80486DX running at 33/40/50MHz,

80486DX2 running at 50/66MHz, 80486

OverDrive

Processor, Pentium

OverDrive

Processor running at 50/66MHz, or 80486SX

running at 25/33MHz

Cyrix or AMD 486DX running at 40MHz

• Uses AMI BIOS: 27512-20 (1)

• Uses OPTi 82C499 chip set

• Cache organization: direct map, write back and bank

interleave

• Supports 64K, 128K and 256K cache sizes

• Memory configurable from 1MB to 64MB

• Uses 256Kx36, 1Mx36 and 4Mx36 HSIMM

Uses 512Kx36, 2Mx36 and 8Mx36 (for Banks 0 and

2 only)

• Supports memory with parity check

• 8MHz bus clock

• Software programmable cache and DRAM wait states

• Supports system BIOS and Video BIOS Shadow

RAM function

• Supports sixteen edge triggered interrupts

• Hidden refresh or slow refresh supported

• Optional Flash memory BIOS supported

• Supports Pentium

OverDrive Processor Zero

Insertion Force socket

• Supports one PS/2 mouse port

• An optional diagnostic LCD port

1-2 u Introduction