GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486IS

Processor      80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor      25/33/50(internal)/66(internal)MHz
Speed
Chip Set       Intel
Max. Onboard   128MB
DRAM
Cache          64/128/256/512KB
BIOS           AMI
Dimensions     230mm x 218mm
I/O Options    32-bit PCI local bus slots (4)
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  Power LED & keylock         J1        Power down mode LED       JP27

  Speaker                     J2        32-bit PCI Local bus       S1
                                        slot

  Turbo LED                   J3        32-bit PCI Local bus       S2
                                        slot

  External power              J5        32-bit PCI Local bus       S3
  control port                          slot

  Reset switch                JP9       32-bit PCI Local bus       S4
                                        slot

  Turbo switch               JP21

                                                                         c

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

  »   CMOS memory normal operation            J4               Open

      CMOS memory clear                       J4              Closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 3

      2MB         (2) 1M x 36        NONE

      4MB         (2) 1M x 36    (2) 1M x 36

      4MB         (2) 2M x 36        NONE

      6MB         (2) 2M x 36    (2) 1M x 36

      8MB         (2) 2M x 36    (2) 2M x 36

      8MB         (2) 4M x 36        NONE

      10MB        (2) 4M x 36    (2) 1M x 36

      12MB        (2) 4M x 36    (2) 2M x 36

      16MB        (2) 4M x 36    (2) 4M x 36

      16MB        (2) 8M x 36        NONE

      18MB        (2) 8M x 36    (2) 1M x 36

      20MB        (2) 8M x 36    (2) 2M x 36

      24MB        (2) 8M x 36    (2) 4M x 36

      32MB        (2) 8M x 36    (2) 8M x 36

      32MB        (2) 16M x 36       NONE

      34MB        (2) 16M x 36   (2) 1M x 36

      36MB        (2) 16M x 36   (2) 2M x 36

      40MB        (2) 16M x 36   (2) 4M x 36

      48MB        (2) 16M x 36   (2) 8M x 36

      64MB        (2) 16M x 36   (2) 16M x 36

      64MB        (2) 32M x 36       NONE

     128MB        (2) 32M x 36   (2) 32M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

      64KB        (4) 8K x 8      (4) 8K x 8      (1) 8K x 8

     128KB        (4) 32K x 8        NONE         (1) 8K x 8

     256KB        (4) 32K x 8     (4) 32K x 8    (1) 16K x 8

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

                   CACHE JUMPER CONFIGURATION

   Size        J6         J7         J9        JP11       JP12

   64KB       Open       Open       Open      Closed     Closed

   128KB      Open      Closed      Open      Closed      Open

   256KB     Closed     Closed      Open       Open      Closed

   512KB     Closed     Closed     Closed      Open       Open

          CPU TYPE CONFIGURATION

        Type                  JP10

       80486SX         pins 2 & 3 closed

       80487SX         pins 2 & 3 closed

       80486DX         pins 1 & 2 closed

      ODP486SX         pins 1 & 2 closed

      80486DX2         pins 1 & 2 closed

  Pentium Overdrive    pins 1 & 2 closed

                   CPU SPEED CONFIGURATION

        Speed                JP7                  JP18

        25MHz          pins 2 & 3 closed         Closed

        33MHz          pins 1 & 2 closed          Open

       50iMHz          pins 2 & 3 closed         Closed

       66iMHz          pins 1 & 2 closed          Open

         PCI IRQ INTERRUPT CONFIGURATION

   IRQ      JP20      JP21      JP22      JP23

    9      Closed     Open      Open      Open

    10      Open     Closed     Open      Open

    11      Open      Open     Closed     Open

    14      Open      Open      Open     Closed