ASUS ISA-386C rev 1.1

The first motherboard launched by ASUS in 1989. ASUS ISA-386C supports 33 MHz and 40 MHz front-side bus speeds.

• Chipset: SiS 85C310/320/330 ("Rabbit"), a high-performance 386DX chipset.
• CPU socket: PGA132. There is also a PGA121 socket for the 387 coprocessor.
• Cache: 64 KB of external cache. The 386 has no on-chip cache.
• RAM: 8× 30-pin FPM SIMM slots, up to 32 MB.

CPU Support

• Intel 386DX-33 or AMD Am386DX-40 or -33.
• Socket for Intel 80387-33, 33/40MHz 80387-compatibles or Weitek 3167.

Am386DX-40

• Cache speed: At 40 MHz the SRAM should be fast enough, about 25 ns or better.
• RAM speed: Use 60 to 70 ns SIMMs.

Memory

The on-board memory installs in eight module mounting sockets which are divided into banks of four sockets each. Memory added to these banks must ne installed a full bank at a time, and in sequence (0 then 1). The on-board memory allows for of up to 32MB of memory.

An additional 32MB of memory can be installed using a proprietary memory expansion card, for a total of 64MB. I don’t have such a memory card.

PSU

Set JP3 power good signal detect from power supply, pins 2 & 3 closed.