UNIDENTIFIED

MS-4123 VERSION 3.0

Processor      80486SX/80487SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor      20/25/33/40/50(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          JP1              Open

      Monitor type select color               JP1             Closed

  »   Factory configured - do not             JP8           pins 2 & 3
      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) 256K x 9    (4) 4M x 9

      17MB        (4) 4M x 9     (4) 256K 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                                 JP2

                64KB                   pins 1 & 2, 4 & 5, 7 & 8, 10 & 11
                                                    closed

               128KB                   pins 1 & 2, 4 & 5, 8 & 9, 11 & 12
                                                    closed

               256KB                   pins 2 & 3, 5 & 6, 8 & 9, 11 & 12
                                                    closed

                          CPU TYPE CONFIGURATION

                 Type                                  JP6

               80486SX                  pins 2 & 5, 3 & 6, 8 & 11, 9 & 12
                                                     closed

               80487SX                  pins 1 & 2, 4 & 5, 7 & 8, 10 & 11
                                                     closed

               80486DX                  pins 1 & 2, 4 & 5, 8 & 9, 11 & 12
                                                     closed

               80486DX2                 pins 1 & 2, 4 & 5, 8 & 9, 11 & 12
                                                     closed

          Pentium Overdrive             pins 1 & 2, 4 & 5, 8 & 9, 11 & 12
                                                     closed

                          CPU SPEED CONFIGURATION

      Speed              JP3               JP5                 JP7

      20MHz           pins 2 & 3      pins 1 & 2, 5 &   pins 2 & 3 closed
                       closed            6 closed

      25MHz           pins 2 & 3        pins 5 & 6      pins 2 & 3 closed
                       closed             closed

      33MHz           pins 1 & 2      pins 1 & 2, 3 &   pins 2 & 3 closed
                       closed            4 closed

      40MHz           pins 1 & 2      pins 1 & 2, 5 &   pins 1 & 2 closed
                       closed            6 closed

      50iMHz          pins 2 & 3        pins 5 & 6      pins 2 & 3 closed
                       closed             closed

      50MHz           pins 1 & 2        pins 5 & 6      pins 1 & 2 closed
                       closed             closed

      66iMHz          pins 1 & 2      pins 1 & 2, 3 &   pins 2 & 3 closed
                       closed            4 closed

  BUS SPEED CONFIGURATION

  CPU speed        JP13

   <= 33MHz        Open

   > 33MHz        Closed