
UNIDENTIFIED

MS-4125 VERSION 2.1

Processor      80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor      25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set       Contaq
Max. Onboard   32MB
DRAM
Cache          64/128/256KB
BIOS           AMI
Dimensions     254mm x 220mm
I/O Options    32-bit VESA local bus slots (2)
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                 Location      Purpose               Location

  Auxiliary keyboard         J2         Turbo LED           J5 pins 12 -
  connector                                                      13

  External battery           J4         Turbo switch        J5 pins 15 -
                                                                 17

  Power LED & keylock   J5 pins 1 - 5   Reset switch        J5 pins 19 -
                                                                 20

  Speaker                J5 pins 6 -    32-bit VESA          SL1 & SL2
                             10         local bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Battery type select internal             J4           pins 2 & 3
                                                              closed

      Battery type select external             J4             Closed

     Monitor type select monochrome          JP17             Open

      Monitor type select color               JP17            Closed

     Factory configured - do not             JP23          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP26          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP37          pins 1 & 2
      alter                                                   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) 256K x 9    (4) 1M x 9

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

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

      16MB        (4) 4M x 9         NONE

      17MB        (4) 4M x 9     (4) 256K x 9

      17MB        (4) 256K x 9    (4) 4M x 9

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

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

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

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8

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

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

                        CACHE JUMPER CONFIGURATION

      Size               JP1               JP6                 JP7

      64KB            pins 1 & 2        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

      128KB           pins 2 & 3        pins 1 & 2      pins 2 & 3 closed
                       closed             closed

      256KB           pins 4 & 5        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

                          CPU TYPE CONFIGURATION

        Type               JP31             JP32               JP33

   80486SX (PQFP)          Open             Open            pins 1 & 2
                                                              closed

   80486SX (PGA)        pins 3 & 4          Open          pins 2 & 3, 4 &
                          closed                             5 closed

      ODP486SX        pins 2 & 3, 4 &     pins 1 & 2      pins 2 & 3, 4 &
                         5 closed          closed            5 closed

      80487SX         pins 2 & 3, 4 &     pins 1 & 2      pins 2 & 3, 4 &
                         5 closed          closed            5 closed

   80486DX (PQFP)       pins 1 & 2        pins 4 & 5        pins 1 & 2
                          closed           closed             closed

   80486DX (PGA)      pins 2 & 3, 4 &     pins 2 & 3      pins 2 & 3, 4 &
                         5 closed          closed            5 closed

      80486DX2        pins 2 & 3, 4 &     pins 2 & 3      pins 2 & 3, 4 &
                         5 closed          closed            5 closed

  Pentium Overdrive   pins 2 & 3, 4 &     pins 1 & 2      pins 2 & 3, 4 &
                         5 closed          closed            5 closed

  Note: Depending on board revision, it will have either a PGA or PQFP
  socket.

                          CPU SPEED CONFIGURATION

     Speed           JP8           JP12           JP13           JP14

     25MHz        pins 2 & 3       Open           Open          Closed
                   closed

     33MHz        pins 1 & 2      Closed          Open           Open
                   closed

     40MHz        pins 1 & 2      Closed         Closed          Open
                   closed

    50iMHz        pins 2 & 3       Open           Open          Closed
                   closed

     50MHz        pins 1 & 2       Open          Closed          Open
                   closed

    66iMHz        pins 1 & 2      Closed          Open           Open
                   closed

  VESA WAIT STATE CONFIGURATION

   Wait states         JP19

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed        JP20

   <= 33MHz        Open

   > 33MHz        Closed

                 VESA CARD TYPE CONFIGURATION

      Card type              JP18                 JP22

       Normal               Closed         pins 1 & 2 closed

    Weitek P9000             Open          pins 2 & 3 closed

