
ORCHID TECHNOLOGY

SUPERBOARD 486/VLB (VERSION 2)

Processor             80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed       20/25/33/50(internal)/50/66(internal)MHz
Chip Set              OPTI
Max. onboard DRAM     32MB
Cache                 128/256KB
BIOS                  AMI
Dimensions            330mm x 218mm
I/O Options           32-bit VESA card slots (2)
NPU Options           None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Power LED & keylock         JP8       32-bit VESA cards        S1 & S2

  Speaker                     JP7       Reset switch               JP9

  Turbo LED                   JP3       Turbo switch              JP10

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

     Monitor type select color                JP26           Closed

      Monitor type select monochrome           JP26            Open

              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

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

      16MB        (4) 4M x 9         NONE

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

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

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

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

                        CACHE JUMPER CONFIGURATION

      Size              JP14               JP16               JP22

      128KB           pins 2 & 3           Open         pins 2 & 3 closed
                       closed

      256KB           pins 1 & 2          Closed        pins 1 & 2 closed
                       closed

                          CPU TYPE CONFIGURATION

    CPU Type       Oscillator     JP12       JP13       JP18       JP19

    80486SX -        20MHz       pins 2      Open       Open     pins 2 &
      20MHz                       & 3                               3

    80486SX -        40MHz       pins 2      Open       Open     pins 1 &
      20MHz                       & 3                               2

    80486SX -        25MHz       pins 2      Open       Open     pins 2 &
      25MHz                       & 2                               3

    80486SX -        50MHz       pins 2      Open       Open     pins 1 &
      25MHz                       & 3                               2

    80486DX -        25MHz       pins 1     Closed      pins 2   pins 2 &
      25MHz                       & 2                    & 3        3

    80486DX -        66MHz       pins 1     Closed      pins 2   pins 1 &
      33MHz                       & 2                    & 3        2

    80486DX -        50MHz       pins 1     Closed      pins 2   pins 2 &
      50MHz                       & 2                    & 3        3

    ODP486SX -       25MHz       pins 2      Open       Open     pins 2 &
      25MHz                       & 3                               3

    ODP486SX -       50MHz       pins 2      Open       pins 2     Open
      25MHz                       & 3                    & 3

    80486DX2 -       25MHz       pins 1     Closed      pins 2   pins 2 &
      50MHz                       & 2                    & 3        3

    80486DX2 -       50MHz       pins 1     Closed      pins 2   pins 1 &
      50MHz                       & 2                    & 3        2

    80486DX2 -       66MHz       pins 1     Closed      pins 2   pins 1 &
      66MHz                       & 2                    & 3        2

         VESA CPU TYPE (ID0 &AMP; ID1) CONFIGURATION

      CPU Type            JP1 (ID0)            JP2 (ID1)

        80386          pins 2 & 3 closed   pins 1 & 2 closed

        80486          pins 1 & 2 closed   pins 2 & 3 closed

             VESA WAIT STATE (ID2) CONFIGURATION

     Wait states          CPU speed            JP4 (ID2)

    0 wait states            33MHz        pins 1 & 2 closed

    1 wait state            > 33MHz        pins 2 & 3 closed

    VESA BUS SPEED (ID3) CONFIGURATION

      CPU speed           JP5 (ID3)

        33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

                VESA ID4 CONFIGURATION

          Setting                  JP6 (ID4)

  Reserved for future use      pins 2 & 3 closed

