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Acer A1GX-1 Motherboard

Jumper and Connector Layout

A1GX-1 Motherboard Diagram

Note - The blackened pin of a jumper represents pin 1.

Overview

The system board has the following major components:

  • 486SX, SX2, DX2, or DX4 series CPU
  • 4-MB onboard RAM expandable to 36 MB
  • Two 72-pin SIMM sockets for memory upgrade
  • 128-KB ROM for system BIOS and VGA BIOS
  • 120-pin connector for ISA riser card
  • System clock/calendar
  • Two 9-pin serial ports
  • One 25-pin Centronics parallel port
  • PS/2-compatible keyboard and mouse interface
  • 512-KB or 1-MB DRAM for onboard local bus VGA interface; expandable to 2 MB
  • Embedded fixed disk interface
  • Upgradable cache memory (128-KB or 256-KB)
  • Optional enhanced IDE interface

CPU Jumper Settings

 Intel 486/P24C AMD NV8T/NV8B486 WB/ P24DEnhanced AMD DX2 SV8T(WT)Enhanced AMD DX4 SV8T(WT)Enhanced AMD DX2 SV8B(WB)Enhanced AMD DX4 SV8B(WB)Cyrix/ IBM/TI DX2Cyrix/ IBM/TI DX2Cyrix/IBM DX4/100Cyrix/ IBM 5x86 (M1SC)Pentium OverDrive P24T
JPX22-32-32-32-32-32-32-32-32-32-32-3
JP132-32-32-32-32-32-32-32-32-32-32-3
JP142-32-32-32-32-32-3OpenOpenOpen2-32-3
JP152-32-32-32-32-32-31-21-21-2Open2-3
JP172-32-32-32-32-32-31-21-21-21st 1-22-3
JP182-32-32-32-31-21-22-32-32-3Open2-3
JP192-31-21-21-21-21-21-21-21-21-21-2
JP20
JP21
JP23
2-32-32-32-32-32-31-21-21-22-32-3
JP22
JP26
2-31-22-32-31-21-22-32-32-32-3
4th 1-2
1-2
JP252-32-32-32-32-32-32-32-32-3Open2-3
JP273-43-42-33-42-33-43-43-43-43-41-2
JP321-21-21-21-21-21-21-22-32-31-21-2

Jumper Settings

Jumper SettingFunction
JP11-2
2-3*
OEM BIOS
Acer BIOS
JP21-2
2-3*
Enable password check
Bypass password
JP31-2
2-3*
COM1 boot
Normal boot
JP4, JP5 1-2, 2-3*
2-3, 1-2
1-2, 1-2
Enable onboard memory (4MB)
Enable onboard memory (8MB)
Disable onboard memory (4MB/8MB)
JP61-2
2-3*
Disable onboard super I/O chip
Enable onboard super I/O chip
JP7 2-3*
1-2
Printer DRQ3
Printer DRQ1
JP81-2
2-3*
Printer DACK1
Printer DACK3
JP91-2
2-3*
Disable onboard VGA
Enable onboard VGA
JP101-2
2-3*
IDE port 0F4H, 0F8H, 0FCH
IDE port 074H, 078H, 07CH
JP111-5
2-6
3-7
25 MHz
33 MHz
40 MHz (not recommended)
JP281-2
2-3*
Enable Suspend/Resume button
Enable Reset button
JP291-2
2-3*
Disable the onboard IDE
Enable the onboard IDE
JPX11-2
2-3*
Flash ROM
EPROM

Connector Functions

ConnectorFeature
CN1VGA Feature connector
CN2Diskette drive connector
CN11Reserved
CN4Secondary IDE Connector
CN5Primary IDE Connector
CN6CPU Fan connector
CN8Multifunction connector

CN8 accommodates the front panel connectors for speaker, LEDs, keylock, reset, and turbo. Figure 1-3 shows the CN17 pin assignments for each of the front panel connectors.

Multi Function Connector

Memory

The system board has two 72-pin SIMM sockets that accept 4-MB, 8-MB, or 16-MB Non-Parity Fast Page Mode memory modules with 70 ns (or less) DRAM speed. Maximum : 32MB


Cache RAM Upgrade Path

SizeData chipsTag chipJP30, JP31
128K4 of 32Kb x 8 (U51-U54)32Kb x 8 (U32)1-2*
256K 8 of 32Kb x 8 (U40,U45-47,U51-54)32Kb x 8 (U32)2-3