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Acer A1G Motherboard

Jumper and Connector Layout

A1G board diagram

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

Overview

  • Supports Full 486 Series CPU And Overdrive Processors
  • Intel SL Enhanced CPU Smm/Smi Supported
  • Microsoft/Intel Apm Compliant Bios
  • Vesa Dpms Supported
  • 4-Mb Memory Upgradable To 36-Mb
  • Up To 256kb Write-Back Second-Level Cache
  • Local-Bus Windows Accelerator
  • Display Memory Upgradable To 2-Mb For GD-5428
  • Maximum Resolution Up To 1280 By 1024 By 256 Colors
  • 24-Bit True Color Display Modes Supported
  • Programmable Hardware Cursor Up To 64 X 64 Pixels
  • Optional Enhanced Ide Supports Up To 4 Devices, Including Cd-Rom And Tape Drive.
  • Optional User-Upgradeable Flash Bios
  • Multiple Security Levels
  • Power Saving Modes
    • Hdd Power Saving Mode
    • Vga Monitor Power Saving Mode
    • Stanby Mode
    • Optional 0 Watt Suspend Mode
  • Mechanical - Front Panel Suspend/Resume Button Security Features

Jumper Settings

JumperSettingFunction
JP1OPENACER BIOS
 CLOSEDOEM BIOS
JP21-2Enable Security
 2-3Disable Security
JP41-2Flash ROM
 2-3EPROM
JP14CLOSEEnable On-Board VGA
 OPENDisable On-Board VGA
JP201-2S-Series CPU
 2-3Normal Intel or AMD
JP21CLOSEDEnable M5105
 OPENDisable M5105
JP22OPENLock Key
 CLOSEDUnlock key
JP281-2Enable On-Board Memory
 2-3Disable On-Board Memory or No On-Board Memory
JP291-2CHRDY
 2-3POE (not in use)

System CPU Clock Selection

CPU ClockJP7*JP8*JP9*JP10JP17JP19
25MHz (DX2/50)2-32-31-22-32-31-2
33MHz (DX2/66)1-22-31-22-32-32-3
40MHz1-21-22-31-21-22-3
50MHz2-32-31-21-21-21-2

*CN14
3-7 = 33MHZ (DX2/66)
4-8 = 25MHZ (DX2/50)

* CPU clock selection will either be through JP7,JP8,JP9 or CN14.

CPU Type Selection

CPU TypeJP11JP12JP13JP39JP18JP33JP30-32JP34-36
4861-21-22-3CLOSED2-31-2OPENCLOSED

Memory

The system board has two SIMM sockets that accept 4-MB, 8-MB, or 16-MB SIMMs, upto a maximum of 32MB (or 36MB if motherboard has 4MB on-board). 72 Pin, 70ns, Parity, Fast Page Mode SIMMS with gold tips recommended.


Cache RAM Upgrade Path

Cache SizeSRAM TypeLocationJP24JP25JP26
64KB8K X 8 X 9 PCSTAG, U56 TO U63OPENOPEN2-3
128KB32K X 8 X 5 PCSTAG, U56,U58,U60,U62OPENCLOSED1-2
256KB32K X 8 X 9 PCSTAG, U56 TO U63CLOSEDCLOSED2-3

Upgrade Video Memory

You can increase VGA RAM to 1 or 2 MB.

To upgrade the VGA RAM, do the following:

1. To upgrade from 512 to 1MB, order p/n 91.00023.901 from Acer Access. To upgrade from 1MB to 2MB order p/n 02.54260.030.
2. Locate the VGA memory expansion sockets on the system board labelled U12, U13, U15 and U16.
3. Gently but firmly insert a 44256 DRAM (256 K bit by 4, 70-ns) chip into each of the VGA memory expansion sockets.

Increasing VGA memory up to 2 MB is an option available to you. To do this, insert two 51460 (256 K bit by 16) DRAM chips on the sockets labelled U10 and U9.