AOpen AP57 User Manual

Motherboard

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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.

1-1

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Page 1 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.
Page 2: Specifications
Overview Specifications Form Factor Baby AT Board Size 220mm x 250mm 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)
Page 3: Board Layout
Overview Board Layout Keyboard connector: The default is AT-compatible keyboard. The P/2-compatible mini-DIN keyboard connector is optional. Power connector: Provides mainboard power. FDC connector: Connects to 3.5-inch/5.25-inch floppy drives. Printer connector: Connects to parallel printer . IDE1 connector: Primary channel for IDE hard disk or CDROM, accepts a maximum of two devices.
Page 4 Overview Voltage Regulators w/ Heatsink: The regulator is used to supply CPU voltage. IrDA connector: Wireless Infrared connector, used as COM2. Front-panel connector: Connector for front panel power reset, suspend switches and power or green LED. IDE LED connector: For front panel IDE LED. CPU fan connector: +12V 2-pin connector for CPU fan.