AOpen AP53 User manual

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1

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Chapter 1

Overview

The AP53 is a high-performance Pentium-based system board that utilizes

the PCI/ISA architecture. It integrates the Intel 430HX PCIset, a super I/O

controller, a PCI mode 4 enhanced IDE controller with bus master support and

a 256-KB pipelined-burst cache to enhance system performance. It also has

four single in-line memory module (SIMM) sockets that allow memory

expansion up to a maximum of 512 MB.

One main feature of AP53 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 AP53 board measures 220 mm x 250 mm and may come with or without a

voltage regulator module (VRM). The VRM enables the board to support future

2.5V processors.

Overview

1-2

1.1 Board Layout

1 Power connector 14 Voltage regulator with heatsink

2SIMM sockets 15 Real-time clock and battery

3 Floppy disk drive connector 16 ISA slots

4 Parallel port connector 17 Keyboard controller

5 Primary IDE connector 18 BIOS

6 Secondary IDE connector 19 Super I/O controller

7 Intel 82439 chip 20 PCI slots

8 Pipelined-burst cache 21 COM1 connector

9 Intel 82371 chip 22 COM2 connector

10 CPU socket 23 PS/2 mouse connector

11 Two-pin fan connector 24 AT-keyboard connector

12 Multifunction connector

13 HDD LED connector

Overview

1-3

1.2 Specifications

Microprocessor Pentium (3.3V) Processor

75/90/100/120/133/150/166/200 MHz

Memory 512 MB (maximum)

SIMM Sockets 72-pin SIMM x 4

ASICs Intel 430HX PCIset

Bus Architecture ISA, PCI

Expansion Slots Three ISA and four PCI slots

Ports One parallel port (SPP/ECP/EPP)

Two serial ports (UART 16C550)

Two-channel PCI mode 4 IDE ports

(bus master transfer support)

One floppy disk drive port

(360/720 K, 1.2/1.44/2.88 MB)

Secondary Cache 256-KB pipelined-burst cache

BIOS AMI Plug-and-Play Flash ROM BIOS

RTC & Battery Dallas DS12887A

Board Size 220 mm x 250 mm

Overview

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1.3 System Board Parts

1.3.1 Microprocessor

The AP53 system board uses an Intel Pentium (3.3V) processor running at 75,

90, 100, 120, 133, 150, 166, or 200 Hz. Chapter 2 tells how to install and

upgrade a Pentium processor.

1.3.2 ASICs

The application-specific integrated circuits (ASICs) are the Intel 82439 and Intel

82371 that belong to the Intel 430HX PCIset. This chipset allows the system to

support a higher memory (512 MB) and a pipelined-burst cache. It also offers

an error checking and correction (ECC) feature that enables the system to

detect, as well as correct the DRAM errors.

The Intel 82439 that comes in a unique ball-grid array (BGA) packaging, acts

as the memory controller data path and the DRAM data bus buffer. The Intel

82371 operates as the PCI/ISA bridge and IDE controller.

1.3.3 BIOS

The board supports the AMI basic input-output system (BIOS). The BIOS is a

program that performs the power-on self test (POST) upon booting. During

POST, this program activates the peripheral devices, tests onboard memory

and prepares the system for operation. For more information on AMI BIOS,

see Chapter 3.

Overview

1-5

1.3.4 Expansion Slots

The board has three ISA and four PCI expansion slots. The ISA expansion

slots are the black parallel bars on the system board. The PCI slots are those

with white color and are shorter than the ISA slots. There are rows of golden

pins inside each slot that serve as a clutch to secure the contacts of the

expansion board. For information on how to install the expansion boards, see

Chapter 2.

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 AP53 motherboard comes with an onboard 256-KB pipelined-burst

second-level cache. This pipelined-burst cache improves system performance

by shortening the DRAM read prefetch time resulting to a faster data transfer

rate.

1.3.7 Two-channel PCI Mode 4 Enhanced IDE Interface

The AP53 board integrates a two-channel PCI mode 4 enhanced integrated

drive electronics (E-IDE) interface that allows the system to support four

E-IDE devices (including hard disks with more than 528-MB capacity) via two

onboard IDE connectors (see section 1.1). This feature offers users increased

data storage capacity.

Overview

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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

1.3.9 Keyboard Connector

The onboard keyboard connector allows you to connect any AT-compatible

keyboard. See the board layout figure for the location of the keyboard

connector. Chapter 2 tells how to connect an AT keyboard.

A PS/2 keyboard connector is an option.

1.3.10 Mouse Connector

The board supports both serial and PS/2 mouse connectors. See Chapter 2 for

details on how to connect a serial and a PS/2 mouse connector.