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Acer J1 Motherboard

Overview

  • CPU:

    StandardOptional
    486SX/25
    486SX/33
    Upgradable to 486DX/33, 486DX2/50, 486DX2/66, ODP486SX/25, ODP486SX/33,
    ODP486DX2/50, ODP486DX2/66
    486DX/33Upgradable to 486DX2/50, 486DX2/66, ODP486DX2/50, ODP486DX2/66
    486DX2/50Upgradable to 486DX2/66, ODP486DX2/50, ODP486DX2/66
    486DX2/66Upgradable to ODP486DX2/50, ODP486DX2/66

    NOTE: The system also supports the 486DX/50 CPU but, the local bus slot cannot be used when it is installed.

  • System Memory: 4MB. Expandable to 256MB.
  • BIOS ROM: 64KB AFlash BIOS Programmable
  • CACHE Memory:
    • Internal - 8KB
    • External - 64KB (Max. 512KB)
  • Expansions Slots:
    • Two 16-bit ISA slots
    • Five 32-bit EISA slots
    • One 32-bit local slot
    • All are bus mastering slots
  • Power Supply: 200 watts (switchable)
  • Keyboard: 101-key enhanced PS/2 compatible
  • Video: ATI Chipset
  • I/O: E4+ IDE/FDD Controller. 2-serial, 1-parallel, 1-mouse, 1-PS/2 keyboard

Jumper Settings

E4+ I/O Card Settings

JumperSettingFunction
JP1 & JP2CLOSEDDMA Channel 7
JP3 & JP4CLOSEDDMA Channel 6
JP5 & JP6CLOSEDDMA Channel 5
JP7 & JP8CLOSED*DMA Channel 0
JP9CLOSEDIRQ Channel 9
JP10CLOSEDIRQ Channel 10
JP11CLOSED*IRQ Channel 11
JP12CLOSEDIRQ Channel 12
JP132-3*Enable Diskette Drive Controller
 1-2Disable Diskette Drive Controller
JP14. JP152-3, 2-3*Parallel Port at LPT2
 1-2, 2-3Parallel Port at LPT1
 2-3, 1-2Parallel Port at LPT3
 1-2, 1-2Disable Parallel Port
JP191-2*Supports Two FDD Drives
 2-3Reserved
JP201-2Enables M5105
 2-3Disables M5105
JP21CLOSED*Enables HDD Cntrlr 0
 OPENDisables HDD Cntrlr 0
JP22CLOSED*Enables HDD Cntrlr 1
 OPENEnables HDD Cntrlr 1
JP231-2M5105 S/W Settings Take Effect
 2-3*M5105 H/W Settings Take Effect
JP16, JP17, JP182-3, 2-3, 2-39 Pin Serial Port = COM1. 25 Pin Serial Port = COM2
 2-3, 1-2, 2-39 Pin Serial Port = COM1. 25 Pin Serial Port = DISABLED
 2-3, 2-3, 1-29 Pin Serial Port = COM2. 25 Pin Serial Port = COM1
 1-2, 2-3, 1-29 Pin Serial Port = DISABLED. 25 Pin Serial Port = COM1
 1-2, 2-3, 2-39 Pin Serial Port = DISABLED. 25 Pin Serial Port = COM2
 2-3, 1-2, 1-29 Pin Serial Port = COM2. 25 Pin Serial Port = DISABLED
 1-2, 1-2, ANY9 Pin Serial Port = DISABLED. 25 Pin Serial Port = DISABLED

* Default setting.

Jumper Settings For CPU Speed

Speed (Mhz)JP1JP2 & JP3
20OPEN1-2
25/DX2-501-21-2
33/DX2-662-31-2
40OPEN2-3
501-22-3

Jumper Selection For CPU Type

JP4CPU Type
OPEN486DX,ODP486DX, 486DX/2
1-2486SX
2-3487SX,ODP486DX2,ODP486SX

Other System Board Jumper Settings

JumperSettingFunction
JP101-2Enable Reset Button
 OPENDisable Reset Button
JP111-2Disable Security
 2-3Enable Security

Memory

The system board has four 72 Pin SIMM sockets ((banks 0/1/2/3) that accept 4-MB, 16-MB, or 64-MB SIMMs, upto a maximum of 256MB.