
ORCHID TECHNOLOGY

SUPERBOARD 486/VLB (Rev. C)

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed  20/25/33/50(internal)/50/66(internal)MHz
Chip Set         EFAR
Max. Onboard DRAM32MB
SRAM Cache       128/256KB
BIOS             AMI
Dimensions       254mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  Turbo LED                   JP3       Reset switch              JP9

  Speaker                     JP7       Turbo switch              JP10

  Power LED & keylock         JP8       32-bit Vesa local       S1 & S2
                                        bus slots

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

     Factory configured - do not alter        JP11            Open

     Monitor type select color                JP26            Open

      Monitor type select monochrome           JP27           Closed

     Factory configured - do not alter        JP27          pins 2 & 3
                                                              closed

     Factory configured - do not alter        JP28          pins 2 & 3
                                                              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

      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          Cache         Location         TAG

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

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

         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

                          CPU TYPE CONFIGURATION

     Type        Speed       OSC      JP12      JP13      JP18      JP19

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

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

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

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

   80487SX       25MHz      25MHz    pins 1    Closed     pins 2   pins 2
                                      & 2                  & 3      & 3

   80487SX       25MHz      50MHz    pins 1    Closed     pins 2   pins 1
                                      & 2                  & 3      & 2

   80487SX       33MHz      66MHz    pins 1    Closed     pins 2   pins 1
                                      & 2                  & 3      & 2

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

   80486DX       25MHz      50MHz    pins 1    Closed     pins 2   pins 1
                                      & 2                  & 3      & 2

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

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

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

   ODP486SX     50iMHz      50MHz    pins 2     Open      Open     pins 1
                                      & 3                           & 2

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

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

  Notes: Pins designated should be in the closed position.

