
BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-8425/33/40/50UUC

Processor  CXM1/80486SX/UMCU5/CX486M6/AM486DX/80486DX/SL80486DX/CX487M7AM486DX2/SL
           AM486DX2/80486DX2/SL80486DX2/AM486DX4/SL AM486DX4
           SL80486DX4/P24D/Pentium Overdrive
Processor  20/25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/
Speed      100(internal)MHz
Chip Set   Unidentified
Max.       128MB
Onboard
DRAM
Cache      128/256KB
BIOS       Award
Dimensions 260mm x 220mm
I/O        Parallel port, serial ports (2), game port, 32-bit PCI slots (3), green
Options    PC connector, floppy drive interface, IDE interfaces (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                 Location

  External battery          CN1       IDE interface LED          D9

  IDE interface 1           CN2       Green PC connector        JP13

  Parallel port             CN3       Speaker               JP15 pins 1 -
                                                                  4

  Game port                 CN4       Power LED &           JP15 pins 5 -
                                      keylock                     9

  Floppy drive              CN5       Turbo LED              JP15 pins 10
  interface                                                     - 11

  Serial port 1             CN6       Reset switch           JP15 pins 12
                                                                - 13

  Serial port 2             CN7       Turbo switch           JP15 pins 14
                                                                - 16

  IDE interface 2           CN8       +5v ground             JP15 pins 17
                                                                - 18

  +5v ground                D8        32-bit PCI slots        PC1 - PC3

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     BIOS type select 12v flash              JP3           pins 1 & 2
                                                              closed

      BIOS type select 5v flash               JP3           pins 2 & 3
                                                              closed

      BIOS type select EPROM                  JP3              Open

     CMOS memory normal operation            JP6           pins 1 & 2
                                                              closed

      CMOS memory clear                       JP6         pins 1 & 2, 3 &
                                                             4 closed

     Factory configured - do not             JP9              N/A
      alter

     Factory configured - do not            JP10              N/A
      alter

     Factory configured - do not            JP11              N/A
      alter

     Factory configured - do not            JP12              N/A
      alter

     Factory configured - do not            JP20              N/A
      alter

     Factory configured - do not            JP21              N/A
      alter

     Factory configured - do not            JP46              N/A
      alter

     Factory configured - do not            JP49              N/A
      alter

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

     2MB         (1) 512K x       NONE           NONE           NONE
                    36

     3MB         (1) 256K x    (1) 256K x     (1) 256K x        NONE
                    36             36             36

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

     4MB         (1) 512K x    (1) 512K x        NONE           NONE
                    36             36

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

     6MB         (1) 512K x    (1) 512K x     (1) 512K x        NONE
                    36             36             36

     8MB         (1) 512K x    (1) 512K x     (1) 512K x    (1) 512K x 36
                    36             36             36

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

     8MB        (1) 2M x 36       NONE           NONE           NONE

     12MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36        NONE

     16MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     16MB       (1) 2M x 36   (1) 2M x 36        NONE           NONE

     16MB       (1) 4M x 36       NONE           NONE           NONE

     24MB       (1) 2M x 36   (1) 2M x 36    (1) 2M x 36        NONE

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1        Bank 2         Bank 3

     32MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

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

     32MB       (1) 8M x 36        NONE          NONE           NONE

     48MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36       NONE

     64MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 8M x 36    (1) 8M x 36       NONE           NONE

     96MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     128MB      (1) 8M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

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

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

   256KB (B)    (4) 64K x 8        NONE       (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP24               JP25               JP26

      128KB             Open            pins 1 & 2            Open
                                          closed

    256KB (A)         pins 1 & 2        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

    256KB (B)         pins 1 & 2        pins 2 & 3            Open
                       closed             closed

                          CPU TYPE CONFIGURATION

      Type          JP27        JP28        JP29       JP30       JP31

      CX M1        Closed       Open       Closed     3 & 4      Closed

     80486SX        Open       Closed      Closed      Open      Closed

     UMC-U5         Open        Open        Open      1 & 2       Open

     CX486M6        Open        Open        Open       Open       Open

     AM486DX        Open       Closed      Closed     3 & 4      Closed

     80486DX        Open       Closed      Closed     3 & 4      Closed

    SL80486DX       Open       Closed      Closed     3 & 4      Closed

     CX486M7        Open        Open        Open      3 & 4       Open

    AM486DX2        Open       Closed      Closed     3 & 4      Closed

   SL AM486DX2      Open       Closed      Closed     3 & 4      Closed
       WT

   SL AM486DX2      Open       Closed      Closed     3 & 4      Closed
       WB

    80486DX2        Open       Closed      Closed     3 & 4      Closed

   SL80486DX2       Open       Closed      Closed     3 & 4      Closed

    AM486DX4        Open       Closed      Closed     3 & 4      Closed

   SL AM486DX4      Open       Closed      Closed     3 & 4      Closed
       WT

   SL AM486DX4      Open       Closed      Closed     3 & 4      Closed
       WB

   SL80486DX4       Open       Closed      Closed     3 & 4      Closed

      P24D          Open       Closed      Closed     3 & 4      Closed

     Pentium        Open        Open        Open      2 & 3       Open
    Overdrive

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

       Type           JP32       JP33       JP34       JP35       JP36

      CX M1         2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

     80486SX        2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

      UMC-U5          Open       Open       Open       Open       Open

     CX486M6        1 & 2, 3     Open      1 & 2       2 & 3      2 & 3
                      & 4

     AM486DX        2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

     80486DX        2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

    SL80486DX       2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

     CX486M7        1 & 2, 3     Open      1 & 2       2 & 3      2 & 3
                      & 4

     AM486DX2       2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

  SL AM486DX2 WT    2 & 3, 4    2 & 3       Open       Open       1 & 2
                      & 5

  SL AM486DX2 WB    2 & 3, 4    2 & 3       Open       Open       1 & 2
                      & 5

     80486DX2       2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

    SL80486DX2      2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

     AM486DX4       2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

  SL AM486DX4 WT    2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

  SL AM486DX4 WB    2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

    SL80486DX4      2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

       P24D         2 & 3, 4     Open       Open       Open       1 & 2
                      & 5

      Pentium       2 & 3, 4     Open      2 & 3       1 & 2      1 & 2
    Overdrive         & 5

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

      Type          JP37     JP38     JP39      JP40     JP41      JP42

      CX M1         Open     2 & 3    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

     80486SX       2 & 3     2 & 3    1 & 2    1 & 2     Open     2 & 3

     UMC-U5        2 & 3     2 & 3    2 & 3    1 & 2     3 & 4    2 & 3

     CX486M6       2 & 3     1 & 2    1 & 2    3 & 4     1 & 2    2 & 3

     AM486DX       2 & 3     2 & 3    1 & 2    1 & 2     Open     1 & 2,
                                                                  3 & 4

     80486DX       2 & 3     2 & 3    1 & 2    1 & 2     Open     1 & 2,
                                                                  3 & 4

    SL80486DX      2 & 3     2 & 3    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

     CX486M7       2 & 3     2 & 3    1 & 2    3 & 4     2 & 3    1 & 2,
                                                                  3 & 4

    AM486DX2       2 & 3     2 & 3    1 & 2    1 & 2     Open     1 & 2,
                                                                  3 & 4

  SL AM486DX2 WT   2 & 3     1 & 2    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

  SL AM486DX2 WB   2 & 3     2 & 3    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

    80486DX2       2 & 3     2 & 3    1 & 2    1 & 2     Open     1 & 2,
                                                                  3 & 4

   SL80486DX2      2 & 3     2 & 3    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

    AM486DX4       2 & 3     2 & 3    1 & 2    1 & 2     Open     1 & 2,
                                                                  3 & 4

  SL AM486DX4 WT   2 & 3     1 & 2    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

  SL AM486DX4 WB   2 & 3     2 & 3    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

   SL80486DX4      2 & 3     2 & 3    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

      P24D         2 & 3     2 & 3    1 & 2    3 & 4     Open     1 & 2,
                                                                  3 & 4

     Pentium       2 & 3     2 & 3    1 & 2    3 & 4,    1 & 2    1 & 2,
    Overdrive                                  5 & 6              3 & 4

  Note: Pins designated should be in the closed position.

                    CPU TYPE CONFIGURATION

        Type                 JP22                 JP23

        Cyrix          pins 2 & 3 closed   pins 1 & 2 closed

         AMD           pins 1 & 2 closed   pins 1 & 2 closed

         UMC           pins 1 & 2 closed   pins 2 & 3 closed

        Intel          pins 1 & 2 closed   pins 1 & 2 closed

          CPU SPEED CONFIGURATION

   Speed      JP5        JP7        JP8

   20MHz      Open       Open      Open

   25MHz      Open       Open     Closed

   33MHz     Closed     Closed    Closed

   40MHz      Open      Closed    Closed

  50iMHz      Open       Open     Closed

   50MHz     Closed      Open      Open

  66iMHz     Closed     Closed    Closed

  75iMHz      Open       Open     Closed

  80iMHz      Open      Closed    Closed

  100iMHz    Closed     Closed    Closed

                         CPU VOLTAGE CONFIGURATION

     Voltage             JP14               JP18               JP19

       3.3v            pins 1 & 2        pins 1 & 2         pins 1 & 2
                        closed             closed             closed

        4v             pins 2 & 3        pins 1 & 2         pins 1 & 2
                        closed             closed             closed

        5v               Open            pins 2 & 3         pins 2 & 3
                                           closed             closed

                      DMA CONFIGURATION

         DMA                 JP47                 JP48

        DMA 1          pins 1 & 2 closed   pins 1 & 2 closed

        DMA 3          pins 2 & 3 closed   pins 2 & 3 closed

