GIGA-BYTE TECHNOLOGY CO., INC.

GA-586AT VER. 2x/3x

Processor          Pentium
Processor Speed    75/90/100/120/133/150/166MHz
Chip Set           UMC
Max. Onboard DRAM  128MB
Cache              256/512KB
BIOS               Award
Dimensions         280mm x 220mm
I/O Options        32-bit PCI slots (3), floppy drive interface, green PC
                   connector, IDE interfaces (2), parallel port, serial
                   ports (2)
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                    Location    Purpose                Location

  Serial port 1                CN1       Green PC LED              J5

  Serial port 2                CN2       Reset switch              J6

  Floppy drive interface       CN3       Turbo switch              J7

  Parallel port                CN4       Turbo LED                 J8

  Chassis fan power             J1       Speaker                   J9

  IDE interface (primary)       J2       Power LED & keylock      J10

  IDE interface                 J3       32-bit PCI slots       PC1 - PC3
  (secondary)

  Green PC connector            J4

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CPU type select VR or standard          JP2              Open
      CPU

      CPU type select VRE CPU                 JP2             Closed

  »   Factory configured - do not             JP12             N/A
      alter

                        DRAM CONFIGURATION

      Size            Bank 0           Bank 1          Bank 2

       2MB        (2) 256K x 36         NONE            NONE

       4MB        (2) 256K x 36    (2) 256K x 36        NONE

       4MB        (2) 512K x 36         NONE            NONE

       6MB        (2) 256K x 36    (2) 256K x 36    (2) 256K x 36

       6MB        (2) 512K x 36    (2) 256K x 36        NONE

       8MB        (2) 512K x 36    (2) 256K x 36    (2) 256K x 36

       8MB         (2) 1M x 36          NONE            NONE

      10MB        (2) 256K x 36     (2) 1M x 36         NONE

      10MB         (2) 1M x 36     (2) 256K x 36        NONE

      12MB        (2) 512K x 36     (2) 1M x 36         NONE

      12MB         (2) 1M x 36     (2) 256K x 36    (2) 256K x 36

      16MB         (2) 1M x 36      (2) 1M x 36         NONE

      16MB         (2) 2M x 36          NONE            NONE

      18MB        (2) 256K x 36     (2) 1M x 36      (2) 1M x 36

      18MB         (2) 2M x 36     (2) 256K x 36        NONE

      20MB        (2) 512K x 36     (2) 1M x 36      (2) 1M x 36

      20MB         (2) 2M x 36     (2) 256K x 36    (2) 256K x 36

      24MB         (2) 1M x 36      (2) 1M x 36      (2) 1M x 36

      24MB         (2) 2M x 36      (2) 1M x 36         NONE

      32MB         (2) 2M x 36      (2) 1M x 36      (2) 1M x 36

      32MB         (2) 4M x 36          NONE            NONE

      34MB        (2) 256K x 36     (2) 4M x 36         NONE

      34MB         (2) 4M x 36     (2) 256K x 36        NONE

      36MB        (2) 512K x 36     (2) 4M x 36         NONE

      36MB         (2) 4M x 36     (2) 256K x 36    (2) 256K x 36

      40MB         (2) 1M x 36      (2) 4M x 36         NONE

      40MB         (2) 4M x 36      (2) 1M x 36         NONE

      48MB         (2) 2M x 36      (2) 4M x 36         NONE

      48MB         (2) 4M x 36      (2) 1M x 36      (2) 1M x 36

      64MB         (2) 4M x 36      (2) 4M x 36         NONE

      64MB         (2) 8M x 36          NONE            NONE

      66MB        (2) 256K x 36     (2) 4M x 36      (2) 4M x 36

      66MB         (2) 8M x 36     (2) 256K x 36        NONE

      68MB        (2) 512K x 36     (2) 4M x 36      (2) 4M x 36

      68MB         (2) 8M x 36     (2) 256K x 36    (2) 256K x 36

      72MB         (2) 1M x 36      (2) 4M x 36      (2) 4M x 36

      72MB         (2) 8M x 36      (2) 1M x 36         NONE

      80MB         (2) 2M x 36      (2) 4M x 36      (2) 4M x 36

                DRAM CONFIGURATION (CON’T)

     Size          Bank 0         Bank 1        Bank 2

     80MB       (2) 8M x 36    (2) 1M x 36    (2) 1M x 36

     96MB       (2) 4M x 36    (2) 4M x 36    (2) 4M x 36

     96MB       (2) 8M x 36    (2) 4M x 36       NONE

     112MB      (2) 8M x 36    (2) 4M x 36    (2) 4M x 36

     128MB      (2) 8M x 36        NONE       (2) 8M x 36

                            CACHE CONFIGURATION

          Size                    Bank 0                    TAG

          256KB                (8) 32K x 8          (1) 8K x 8 or (1) 32K
                                                            x 8

          512KB                (8) 64K x 8         (1) 16K x 8 or (1) 32K
                                                            x 8

        CACHE JUMPER CONFIGURATION

        Size                 JP3

        256KB         pins 1 & 2 closed

        512KB         pins 2 & 3 closed

                   CPU SPEED CONFIGURATION

        Speed                JP4                  JP5

        75MHz          pins 2 & 3 closed   pins 2 & 3 closed

        90MHz          pins 1 & 2 closed   pins 1 & 2 closed

       100MHz          pins 1 & 2 closed   pins 2 & 3 closed

       120MHz          pins 1 & 2 closed   pins 1 & 2 closed

       133MHz          pins 1 & 2 closed   pins 2 & 3 closed

       150MHz          pins 1 & 2 closed   pins 1 & 2 closed

  CPU SPEED CONFIGURATION (VERSION 2X ONLY)

         Speed                   JP6

         75MHz                  Open

         90MHz                  Open

        100MHz                  Open

        120MHz                 Closed

        133MHz                 Closed

       CPU SPEED CONFIGURATION (VERSION 3X ONLY)

           Speed                        JP6

           75MHz                       Open

           90MHz                       Open

           100MHz                      Open

           120MHz                pins 1 & 2 closed

           133MHz                pins 1 & 2 closed

           150MHz            pins 1 & 2, 3 & 4 closed

           166MHz            pins 1 & 2, 3 & 4 closed

  Note: On version 3x, JP6 is a 4-pin jumper.