GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486VM

Processor            80486SX/80487SX/80486DX/80486DX2
Processor Speed      20/25/33/50(internal)/50/66(internal)MHz
Chip Set             UMC
Max. Onboard DRAM    32MB
SRAM Cache           64/128/256KB
BIOS                 AMI
Dimensions           254mm x 218mm
I/O Options          VESA local bus slots (3)
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J2       Speaker                     J8

  Turbo LED                   J5       Power LED & keylock         J9

  Reset switch                J6       32-bit VESA card (3)      S1 - S3

  Turbo switch                J7

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             J3            pins 1 & 2
                                                              closed

      CMOS memory clear                        J3            pins 2 & 3
                                                              closed

  »   Monitor type select color                J11            closed

      Monitor type select monochrome           J11             open

  »   VESA bus wait states select 0            JP5             open

      VESA bus wait state select 1             JP5             open

                         CPU JUMPER CONFIGURATION

    CPU Type        OSC         JP2         JP6        W5          W6

   80486SX-20      20MHz      pins 1 &     open       open     pins 2 & 3
                              2 closed                           closed

   80486SX-20      40MHz      pins 1 &     open      closed    pins 2 & 3
                              2 closed                           closed

   80486SX-25      25MHz      pins 1 &     open       open     pins 2 & 3
                              2 closed                           closed

   80487SX-25      25MHz      pins 1 &     open       open     pins 1 & 2
                              2 closed                           closed

   80486DX-25      25MHz      pins 1 &     open       open     pins 1 & 2
                              2 closed                           closed

   80486DX-33     33.3MHz     pins 1 &     open       open     pins 1 & 2
                              2 closed                           closed

   80486DX-40      40MHz      pins 1 &     open       open     pins 1 & 2
                              2 closed                           closed

   80486DX-50      50MHz      pins 2 &    closed      open     pins 1 & 2
                              3 closed                           closed

  80486DX2-50      25MHz      pins 1 &     open       open     pins 1 & 2
                              2 closed                           closed

  80486DX2-66     33.3MHz     pins 1 &     open       open     pins 1 & 2
                              2 closed                           closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 1M x 9     (4) 256K x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                         SRAM JUMPER CONFIGURATION

     Size           W1            W2             W3              W4

     64KB          open          open         pins 1 & 2      pins 1 & 2
                                               closed          closed

    128KB         closed         open         pins 2 & 3      pins 2 & 3
                                               closed          closed

    256KB         closed        closed        pins 1 & 2      pins 2 & 3
                                               closed          closed

                    SRAM CONFIGURATION

     Size        Cache SRAM      Location         TAG

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 8K x 8

     128KB      (4) 32K x 8       Bank 0      (1) 8K x 8

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 32K x 8