AOpen AP57 User Manual

1-1

Chapter 1

Overview

The AP57 is a high-performance Pentium-based system board that utilizes
the PCI/ISA architecture. It integrates the SiS 5571 PCIset, a super I/O
controller, and a PCI mode 4 enhanced IDE controller with bus master
support to enhance system performance. It has four single in-line memory
module (SIMM) sockets that allow system memory expansion up to a
maximum of 256MB. It also supports 256KB and 512KB pipelined-burst
second-level cache.

One main feature of AP57 is the green power-management function that
extends energy conservation from system components to display monitor. It
complies with the power-saving standards of the U.S. Environmental
Protection Agency (EPA) Energy Star program.

The AP57 board measures 220 mm x 250 mm.

Overview

1-2

1.1 Specifications

Form Factor

Baby AT

Board Size

220mm x 250mm

CPU

Intel Pentium Processor P54C, PP/MT (P55C), AMD
K5 and Cyrix 6x86

System Memory

FPM (Fast Page Mode) or EDO (Extended Data
Output) 72-pin SIMM x4, maximum 256MB.

Second-level Cache

256KB or 512KB pipelined-burst cache onboard

Chipset

SiS 5571 PCIset (480-pin BGA Package)

Expansion Slots

ISA x3 and PCI x4

Serial Port

Two serial ports UART 16C550 compatible

Parallel Port

One parallel port supports standard parallel port
(SPP), enhanced parallel port (EPP) or extended
capabilities port (ECP).

Floppy Interface

Floppy interface supports 3.5-inch drive with 720KB,

1.44MB or 2.88MB format or

5.25-inch drive with 360KB, 1.2MB format

IDE Interface

Dual-channel IDE interface supports a maximum of 4
IDE hard disks or CDROM.
Mode 4 and bus master hard disk drives are also
supported.

USB Interface
(optional)

USB bracket that supports two USB ports . The
BIOS also supports USB driver to simulate
legacy keyboard.

PS/2 Mouse

Via PS/2 mouse bracket

Keyboard

Default: AT compatible keyboard
Mini-DIN PS/2 keyboard connector is optional.

BIOS

Award Plug-and-Play Flash ROM BIOS

RTC

RTC build in chipset

Battery

Lithium (CR2032)