User Guide

Overview
1-5
1.3.5 DRAM Sockets
The system board has four 72-pin SIMM sockets that allow you to expand
system memory to a maximum of 512 MB. These sockets accept both single-
density and double-density SIMMs. Chapter 2 tells how to install memory
modules and the different memory configurations available.
1.3.6 Second-level Cache
The AX53 motherboard may come with 256-KB or 512-KB pipelined-burst
second-level cache. The board with 256-KB second-level cache also comes
with a COAST cache upgrade socket. The cache upgrade socket enables you
to upgrade cache to 512 KB.
The pipelined-burst cache improves system performance by shortening the
DRAM read prefetch time resulting to a faster data transfer rate.
1.3.7 Dual-channel PCI Mode 4 Enhanced IDE
Connectors
The AX53 board integrates two dual-channel PCI mode 4 enhanced integrated
drive electronics (E-IDE) connectors that allow the system to support four
E-IDE devices (including hard disks with more than 528-MB capacity). This
feature offers users increased data storage capacity.
1.3.8 Super I/O Controller
The onboard super I/O controller accommodates the following:
• Two UART 16450/16550-compatible fast serial ports
• A parallel port with standard parallel port (SPP), enhanced parallel port
(EPP) or extended capabilities port (ECP) support. Both the EPP and
ECP comply with the IEEE 1284 standards.
• 3.5-inch floppy disk drives with 720-KB, 1.44-MB or 2.88-MB format.
• 5.25-inch floppy disk drives with 360-KB, 1.2-MB format