
BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-1425/33/40/50UCV-B/C/D/E

Processor  CX486S/80486SX/80487SX/80486DX/ODP486SX/80486DX2/80486DX4/ Pentium
           Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Max.       64MB
Onboard
DRAM
Cache      32/64/128/256KB
BIOS       AMI
Dimensions 254mm x 218mm
I/O        32-bit VESA local bus slots (3), green PC connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location      Purpose              Location

  Daughter board             BC20        Turbo LED         JP15 pins 10 -
  connector                                                      11

  External battery            JP8        Reset switch      JP15 pins 12 -
                                                                 13

  Green PC connector         JP14        Turbo switch      JP15 pins 14 -
  (Ver. D & E)                                                   16

  Speaker                JP15 pins 1 -   +5v ground        JP15 pins 17 -
                               4                                 18

  Power LED & keylock    JP15 pins 5 -   32-bit VESA         SL1 - SL3
                               9         local bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Password normal operation               JP3              Open

      Password memory clear                   JP3             Closed

     CMOS memory normal operation            JP8           pins 2 & 3
                                                              closed

      CMOS memory clear                       JP8           pins 3 & 4
                                                              closed

      Battery type select external            JP8             Closed

     Power good signal detect from           JP11          pins 1 & 2
      power supply                                            closed

      Power good signal detect from           JP11          pins 2 & 3
      board                                                   closed

     CPU type select PQFP or PGA             JP12          pins 1 & 2
                                                              closed

      CPU type select PGA enabled &           JP12          pins 2 & 3
      PQFP disabled                                           closed

     Monitor type select color (Ver.         JP14          pins 2 & 3
      B & C only)                                             closed

      Monitor type select monochrome          JP14          pins 1 & 2
      (Ver. B & C only)                                       closed

     VGA card select normal card             JP28          pins 1 & 2
                                                              closed

      VGA card select Weitek Power            JP28          pins 2 & 3
      9000 VGA card only                                      closed

     Cyrix CPU type select CX486DX           JP34             Open

      Cyrix CPU type select CX486DX2          JP34            Closed

     Factory configured - do not             JP36             Open
      alter

     Mouse COM port select COM2              JP39          pins 1 & 2
                                                              closed

      Mouse COM port select COM1              JP39          pins 2 & 3
                                                              closed

                           DRAM CONFIGURATION

       Size             Bank 0            Bank 1            Bank 2

       1MB           (4) 256K x 9          NONE              NONE

       2MB           (4) 256K x 9     (1) 256K x 36          NONE

       3MB           (4) 256K x 9     (1) 256K x 36     (1) 256K x 36

       4MB           (4) 256K x 9     (1) 256K x 36     (1) 512K x 36

       5MB           (4) 256K x 9      (1) 1M x 36           NONE

       6MB           (4) 256K x 9      (1) 1M x 36      (1) 256K x 36

       8MB            (4) 1M x 9       (1) 1M x 36           NONE

       10MB           (4) 1M x 9       (1) 1M x 36      (1) 512K x 36

       12MB           (4) 1M x 9       (1) 1M x 36       (1) 1M x 36

       16MB           (4) 1M x 9       (1) 1M x 36       (1) 2M x 36

       20MB           (4) 4M x 9       (1) 1M x 36           NONE

       24MB           (4) 4M x 9       (1) 1M x 36       (1) 1M x 36

       32MB           (4) 4M x 9       (1) 4M x 36           NONE

       36MB           (4) 4M x 9       (1) 1M x 36       (1) 4M x 36

       48MB           (4) 4M x 9       (1) 4M x 36       (1) 4M x 36

       64MB          (4) 16M x 9           NONE              NONE

  Note: If this board uses 30-pin and 72-pin modules, use this table.

                            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              (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

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

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

          64MB                 (4) 16M x 9                 NONE

  Note: If this board does not use 72-pin sockets, use this table.
  Depending on board revision, it will have either this setup or the
  above setup.

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

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

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

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

   256KB (A)    (4) 32K x 8    (4) 32K x 8    (1) 16K x 8

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

                        CACHE JUMPER CONFIGURATION

    Size         JP5          JP6         JP7          JP9         JP10

    32KB        2 & 3        Open         Open         Open        Open

    64KB        1 & 2        Open         Open        Closed       Open

    128KB       2 & 3        2 & 3       Closed       Closed       Open

  256KB (A)     1 & 2        1 & 2       Closed       Closed      2 & 3

  256KB (B)     1 & 2        1 & 2       Closed       Closed      1 & 2

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

           Type                     JP16                    JP17

          CX486S                    Open              pins 2 & 3 closed

          80486SX                   Open              pins 2 & 3 closed

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

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

          80486DX             pins 1 & 2 closed       pins 1 & 2, 3 & 4
                                                           closed

         80486DX2             pins 1 & 2 closed       pins 1 & 2, 3 & 4
                                                           closed

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

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

               CPU SPEED CONFIGURATION

   Speed      JP21       JP22      JP23       JP27

   25MHz     Closed      Open     Closed      Open

   33MHz     Closed     Closed     Open       Open

   40MHz      Open       Open     Closed     Closed

  50iMHz     Closed      Open     Closed      Open

   50MHz      Open      Closed     Open      Closed

  66iMHz     Closed     Closed     Open       Open

  75iMHz     Closed      Open     Closed      Open

  100iMHz    Closed     Closed     Open       Open

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

        Speed                  JP41

          2x            pins 2 & 3 closed

          3x            pins 1 & 2 closed

                         CPU VOLTAGE CONFIGURATION

         Voltage                   JP42                     JP44

          3.3v                     Open                     Open

           5v                pins 3 & 5, 4 & 6        pins 1 & 2, 3 & 4
                                  closed                   closed

  VESA BUS CLOCK CONFIGURATION (SLOT 1)

       Setting               JP26

     Synchronous       pins 1 & 2 closed

    Asynchronous       pins 2 & 3 closed

  VESA BUS CLOCK CONFIGURATION (SLOT 2)

       Setting               JP25

     Synchronous       pins 1 & 2 closed

    Asynchronous       pins 2 & 3 closed

  VESA BUS CLOCK CONFIGURATION (SLOT 3)

       Setting               JP29

     Synchronous       pins 1 & 2 closed

    Asynchronous       pins 2 & 3 closed

        VGA CARD CONFIGURATION (CIRRUS LOGIC VER. AB)

      CPU speed              JP19                 JP20

        25MHz          pins 2 & 3 closed   pins 1 & 2 closed

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

        40MHz          pins 1 & 2 closed   pins 1 & 2 closed

        50MHz          pins 1 & 2 closed   pins 1 & 2 closed

        VGA CARD CONFIGURATION (CIRRUS LOGIC VER. AC)

      CPU speed              JP19                 JP20

        25MHz          pins 2 & 3 closed   pins 1 & 2 closed

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

        40MHz          pins 1 & 2 closed   pins 2 & 3 closed

        50MHz          pins 1 & 2 closed   pins 2 & 3 closed

