UNIDENTIFIED

80486 MOTHERBOARD

Processor        CX486S/80486SX/80487SX/80486DX/80486DX2/80486DX4
Processor Speed  25/33/40/50/50i/66i/75i/100iMHz
Chip Set         Unidentified
Max. Onboard DRAM64MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       250mm x 220mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  CPU power board             J10       Turbo LED                 JP18

  External battery            JP1       Reset switch              JP19

  Power LED & Keylock        JP16       Turbo switch              JP20

  Speaker                    JP17       32-bit VESA local       SL1-SL3
                                        bus slots

                        USER CONFIGURABLE SETTINGS

                Function
                                             Jumper
                                                             Position

  »
      VL-bus card select general
                                              JP2
                                                            pins 1 & 2
                                                              closed


      VL-bus card select Power 9000
                                              JP2
                                                            pins 2 & 3
                                                              closed

  »
      Factory configured - do not
      alter
                                              JP3
                                                               N/A

  »
      80486DX4 power board voltage
      select 3.45
                                              JP4
                                                               Open


      80486DX4 power board voltage
      select 5
                                              JP4
                                                              Closed

  »
      80486DX4 clock speed select
      tripled
                                              JP28
                                                              Closed


      80486DX4 clock speed select
      doubled
                                              JP28
                                                               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

      5MB         (4) 1M x 9         256K

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

      16MB        (4) 4M x 9         NONE

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

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

      64MB        (4) 16M x 9        NONE

                            CACHE CONFIGURATION

     Size
                 Bank 0
                             Bank 1
                                           Tag (U28)
                                                             Tag (U29)

     64KB
                (4) 8K x
                   8
                            (4) 8K x
                               8
                                          (1) 8K x 8
                                                               NONE

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

    256KB
                (4) 32K x
                   8
                            (4) 32K x
                               8
                                         (1) 8K x 8 or
                                          (1) 32K x 8
                                                           (1) 8K x 8 or
                                                               NONE

                        CACHE JUMPER CONFIGURATION

     Size           JP9            JP10           JP11           JP12

     64KB        pins 1 & 2        Open           Open           Open
                  closed

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

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

    CPU CLOCK SPEED CONFIGURATION (MX8310)

   Speed
               JP13
                           JP14
                                       JP15

   25MHz
              Closed
                           Open
                                       Open

   33MHz
              Closed
                          Closed
                                      Closed

   40MHz
              Closed
                          Closed
                                       Open

   50MHz
               Open
                           Open
                                      Closed

  50i MHz
              Closed
                           Open
                                       Open

  66i MHz
              Closed
                          Closed
                                      Closed

  75i MHz
              Closed
                           Open
                                       Open

  100i MHz
               Open
                           Open
                                      Closed

  CPU CLOCK SPEED CONFIGURATION (KTS0802C/PLL52C05)

    Speed         JP13          JP14         JP15

    25MHz        Closed        Closed        Open

    33MHz         Open         Closed        Open

    40MHz        Closed         Open        Closed

    50MHz        Closed         Open         Open

   50i MHz       Closed        Closed        Open

   66i MHz        Open         Closed        Open

   75i MHz       Closed        Closed        Open

   100i MHz      Closed         Open         Open

                              CPU TYPE SELECT

        Type
                         JP5-JP8
                                             JP22
                                                               JP23

      CX 486S
                          Closed
                                          pins 2 & 3
                                            closed
                                                               Open

      80486SX
                          Closed
                                          pins 2 & 3
                                            closed
                                                               Open

      80487SX
                          Closed
                                        pins 1 & 2,3 &
                                           4 closed
                                                             pins 2 & 3
                                                              closed

     486DX/DX2
                          Closed
                                        pins 1 & 2,3 &
                                           4 closed
                                                             pins 1 & 2
                                                              closed

      80486DX4
                           Open
                                        pins 1 & 2,3 &
                                           4 closed
                                                             pins 1 & 2
                                                              closed

  Note: Using 80486DX4, CPU power board (optional) must be in J10.

  VESA BUS SPEED CONFIGURATION

     Speed            JP21

     25MHz            Open

     33MHz            Open

     40MHz            Open

     50MHz           Closed

    50i MHz           Open

    66i MHz           Open

    75i MHz           Open

    100i MHz         Closed