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Acer J3 Motherboard

Jumper and Connector Layout

j3 board diagram

Overview

  • CPU: 486DX/33,486DX2/50,486DX2/66,Pentium-60, Pentium-66
  • Cache: 8K Internal Cache Standard;Expandable to 256K/512K/1MB Secondary Write-Back Cache
  • BIOS: FLASH BIOS
  • Memory:
    • 4MB Onboard; Expandable to 256MB Using 64MB SIMMS (486 CPU Installed)
    • 4MB Onboard; Expandable to 512MB Using 64MB SIMMS (Pentium CPU Installed)
  • Graphics: VL Bus Accelerated VGA; 1MB DRAM, Expandable to 2MB
  • I/O: 2 SERIAL, 1 PAR, PS/2 MOUSE, FDD & IDE
  • Expansion:
    • SIX 32-Bit EISA Slots
    • TWO 32-Bit VESA Slots
    • ONE CPU Board Slot
  • Housing: ID3-P
  • Dimension: 41.7 CM (D) X 43.2 CM (W) X 15.5 CM (H)
  • P/S: 200W SPS (100/120V,200/240V)
  • S/W: AFLASH UTIL,EISA UTIL,DOS 6.0

Jumper Settings

JumperSettingFunction
JP1 & JP2OPEN*With SCSI
 CLOSEDWithout SCSI
JP31-2*0 min. wait for Local Bus
 2-31 min. wait
JP41-2*< =33Mhz for VESA Local Bus
 2-3> 33Mhz
JP61-2Security Enable
 2-3*Security Disable
JP7CLOSED*Reset Enable
 OPENReset Disable
JP81-2IRQ Select - IRQ10
 2-3*IRQ Select - IRQ11
JP91-2*Internal Speaker (Select)
 2-3External Speaker
JP10, JP11, JP12, JP132-3, 2-3, 2-3, 2-3*RTC Select - Dallas
 1-2, 1-2, 1-2, 1-2RTC Select - B.M.

486 CPU Board Jumper Settings

TitleJumperSettingFunction
CPU ClockJP1OPEN25 MHz (DX2-50), 33 MHz (DX2-66)
  CLOSED40 MHz, 50 MHz
 JP2OPEN25 MHz (DX2-50), 40 MHz
  CLOSED33 MHz (DX2-66), 50 MHz
PGA CPU TypeJP4OPEN486DX, 486DX2
  1-2486SX
  2-3487SX, ODP, 486SX, P24T
LADA Setting (VESA)JP31-2*33 MHz
  2-350 MHz
Local Bus EnablingJP101-2Disable
  2-3*Enable
System SpeedJP81-225 MHz, 33 MHz
  2-340 MHz, 50 MHz
 JP91-225 MHz, 40 MHz
  2-333 MHz, 50 MHz
SRAM (Cache) SizeJP11, JP19OPEN64 KB
  CLOSED128/256KB 1 MG
 JP12, JP20OPEN64/128 KB
  CLOSED256 KB, 1 MB
 JP13, JP14, JP18OPEN64/128/256 KB
  CLOSED1 MB
RAM (Cache) SizeJP15, JP161-2Single Bank
  2-3Double Bank
CPU Speed SelectionJP171-2, 3-4< 33 MHz VESA
  2-3> =33 MHz

Pentium CPU Board Jumper Settings

TitleJumperSettingFunction
Oscillator FrequencyJP11-233/50/80 MHz
  2-340/66 MHz
 JP21-233/66/80 MHz
  2-340/50 MHz
 JP31-240/50/66/80 MHz
  2-333 MHz
Local BusJP41-2*Enable
  2-3Disable
SRAM (Cache) SizeJP11, JP12, JP14, JP15OPEN256 KB
  CLOSED1 MB

Memory

486 CPU Systems - The system comes with standard 4-MB/8-MB memory. You can upgrade the system memory by adding 72-pin 80ns memory modules. The system supports 4-/8-/16-/32-/64-MB single density or 8-MB and 32-MB double density SIMMS. Using Single density SIMMS you can populate all 4 banks to a maximum of 256MB. Using Double density SIMMS you can populate Bank 0 and 1 up to a maximum of 64MB.

Pentium Systems - The system comes with standard 8MB memory. You can upgrade this system by adding 72-pin 80ns memory modules. The system supports 4-/8-/16-/32-/64-MB SIMMs up to a maximum of 256MB. Unlike the 486 board, the memory must be fitted in matching pairs. Bank 0 and Bank 1 can contain different sizes of memory. This also applies to the memory card, which can only be used when all the memory sockets on the motherboard are full. With the memory card, the maximum memory is pushed up to 512MB.

Note - This is my interpretation of the information on Acer's website. It may be worth double-checking with Acer before upgrading.


Cache

486 CPU Board

Cache sizeSRAM (20ns)Tag RAM (15ns)Dirty RAM(15ns)
64KB8K*8*88K*8*116K*1*1
128KB32K*8*48K*8*116K*1*1
256KB32K*8*832K*8*116K*1*1
1MB128K*8*8128K*8*164K*1*1

Pentium Second Level Cache Upgrade

Cache sizeSRAM (15ns)Tag RAM (12ns)Dirty RAM(12ns)
256KB32K*8*88K*8*18K*8*1
1MB128K*8*832K*8*164K*1*1