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Acer A1GX-2 Motherboard

Jumper and Connector Layout

A1GX-2 Motherboard Diagram

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

Overview

  • CPU Information:
    • Socket: ZIF
    • CPU Types: Intel 80486 SX, Intel 80486 SX2, Intel 80486 DX, Intel 80486 DX2, Intel P24T, Intel P24D, Intel P24C, Cyrix, IBM, TI, AMD
    • Clockspeeds: 25 MHz, 33 MHz, 40 MHz
  • On-Board Memory: 4 MB RAM (non-parity)
  • On-Board Video: CL-GD5430 5440/5434
  • BIOS Type: Acer Flash
  • Bus Type: Riser Card: 3 ISA
  • On-Board Controller: Enhanced IDE (M5213N)
  • Chipset: ALI
  • I/O Ports:
    • 2 9-pin Serial (NS16C550)
    • 1 25-pin Parallel
    • (Bi-directional) (EPP) (ECP)
  • Cases: Aspire Desktop

CPU Jumper Settings

  Intel 486
3.3V(P24C)
Intel 486
3.3V WB
Cyrix/IBM/TI DX2Cyrix/IBM/TI
DX2
Cyrix DX4/100TI DX4/100Cyrix 5x86 (M1SC)AMD DX2 NV8T
JP172-32-31-21-21-21-21st 1-2
6th 2-3
7th 2-3
2-3
JP181-21-22-32-32-32-3Open1-2
JP192-31-21-21-21-22-31-22-3
JP262-31-22-32-32-32-34th 1-2
5th 1-2
6th 2-3
7th 2-3
2-3
JP273-43-43-43-43-43-43-42-3
JP321-21-21-22-31-21-21-21-2
JP361-21-21-21-21-21-21-21-2


  AMD DX4
NV8T
AMD DX2
NV8B
AMD DX4 NV8BEnhanced AMD DX2
SV8T(WT)
Enhanced AMD DX4
SV8T(WT)
Enhanced AMD DX2
SV8B(WB)
Enhanced AMD DX4
SV8B(WB)
JP172-32-32-32-32-32-32-3
JP182-31-22-32-32-31-21-2
JP192-31-21-21-21-21-21-2
JP262-31-21-22-32-31-21-2
JP273-42-33-42-33-42-33-4
JP321-21-21-21-21-21-21-2
JP361-21-21-21-21-21-21-2

Jumper Settings

JumperSettingFunction
JP11-2
2-3
OEM BIOS
Acer BIOS
JP21-2
2-3
Enable password check
Bypass password
JP31-2
2-3
MONO/COM1 boot
Normal (VGA)
JP52-3
1-2
Enable onboard memory
Disable onboard memory
JP62-3
1-2
Enable onboard super I/O chip
Disable onboard super I/O chip
JP71-2
2-3
Printer DRQ1
Printer DRQ3
JP81-2
2-3
Printer DACK1
Printer DACK3
JP92-3
1-2
Enable onboard VGA
Disable onboard VGA
JP102-3
1-2
IDE port 074H, 078H, 07CH
IDE port 0F4H, 0F8H, 0FCH
JP 111-4
2-5
3-6
25 MHz clock frequency
33 MHz clock frequency
40 MHz clock frequency
JP 122-3
2-3
1-2
25 MHz clock frequency
33 MHz clock frequency
40 MHz clock frequency
JP281-2
2-3
Enable Suspend/Resume button
Enable Reset button
JP291-2
2-3
Disable onboard IDE
Enable onboard IDE
JP331-2
2-3
Feature connector
I2C interface
JP35Open
Closed
IDE LED function
IDE, FDD, CD-ROM LED functions
JPX11-2
2-3
Flash ROM
EPROM

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

Module Description : 72-Pin, 70ns, Non-Parity Fast Page Mode SIMMS with gold tips. Maximum : 32MB


Video Memory

The system board comes with 1-MB video memory onboard upgradable to 2 MB. Contact Acer to order the video upgrade kit. Note - 800x600x16 million colors is not available when video memory is upgraded to 2 MB on CL-5430 and CL-5440 chipsets.

Cache RAM Upgrade Path

SizeData chipsTag chipJP30JP31
128K 4 of 32Kb x 8 (U51 - U54)32Kb x 8 (U32)1-2*1-2*
256K 8 of 32Kb x 8 (U40,U45-7,U51-4)32Kb x 8 (U32)2-32-3

Note - Speed in both cases is 15ns for all chips