
BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-8425UUD-A, MB-8433UUD-A, MB-8440UUD-A (VER. 1 & 2, ALL MODELS)

Processor  UMCU5S/CX486DX/AM486DX/(SL)AM486DX(SV8B)/(SL)AM486DX(SV8T)/80486DX/CX486DX2/AM486DX2/9SL)AM486DX2(SV8B)/
           (SL)AM486DX2(SV8T)/80486DX2/CX486DX4/(SL)CX486DX4/AM486DX4/(SL)AM486DX4(SV8B)/(SL)AM486DX4(SV8T)/80486DX4/P24D/P24T/
           CX5X86/AM5X86
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Video Chip None
Set
Maximum    128MB
Onboard
Memory
Maximum    None
Video
Memory
Cache      128/256/512KB
BIOS       Award
Dimensions 220mm x 220mm
I/O        32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port,
Options    serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  Serial port 1            CN1         Green PC LED         JP1 pins 14 &
                                                                 15

  Serial port 2            CN2         Reset switch          JP1 pins12 &
                                                                 13

  Parallel port            CN3         Green PC connector   JP1 pins 17 &
                                                                 18

  Floppy drive             CN4         IDE interface LED    JP1 pins 20 &
  interface                                                      21

  IDE interface 1          CN5         Turbo switch         JP1 pins 23 &
                                                                 24

  IDE interface 2          CN6         +12v ground          JP1 pins 25 &
                                                                 26

  PS/2 mouse port          CN7         External battery         JP42

  Speaker              JP1 pins 1- 4   PS/2 mouse               JP47
                                       interface

  Power LED &          JP1 pins 5 -    32-bit PCI slots       PC1 - PC3
  keylock                   9

  Turbo LED            JP1 pins 10 &
                            11

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     Dallas DS12887A normal operation        JP12       Pins 3 & 4 open

      Dallas DS12887A clear                   JP12          Pins 3 & 4
                                                              closed

      Flash BIOS voltage select 12v           JP13          Pins 2 & 3
                                                              closed

      Flash BIOS voltage select 5v            JP13          Pins 1 & 2
                                                              closed

      EPROM BIOS used                         JP13             Open

     CMOS memory normal operation            JP42          Pins 2 & 3
                                                              closed

      CMOS memory clear                       JP42          Pins 3 & 4
                                                              closed

      Battery type select external            JP42            Closed

  Note: JP12 is only present if the Dallas DS12887A(BQ3287A)/OEC12C887A
  clock is installed.

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        None           None           None
                    36

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

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

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

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

     4MB        (1) 512K x     (1) 256K x     (1) 256K x        None
                    36             36             36

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

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

     5MB       (1) 1M x 36     (1) 256K x        None           None
                                   36

     5MB        (1) 512K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

     5MB        (1) 256K x     (1) 512K x     (1) 512K x        None
                    36             36             36

     5MB        (1) 256K x    (1) 1M x 36        None           None
                    36

     6MB       (1) 1M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     6MB       (1) 1M x 36     (1) 512K x        None           None
                                   36

     7MB        (1) 256K x     (1) 512K x     (1) 512K x    (1) 512K x 36
                    36             36             36

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

     8MB       (1) 1M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

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

     9MB        (1) 256K x    (1) 2M x 36        None           None
                    36

     10MB      (1) 2M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     10MB      (1) 2M x 36     (1) 512K x        None           None
                                   36

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

     11MB      (1) 2M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     12MB      (1) 2M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

     12MB      (1) 2M x 36    (1) 1M x 36        None           None

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

     12MB      (1) 1M x 36    (1) 2M x 36        None           None

     13MB       (1) 256K x    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36
                    36

     14MB      (1) 2M x 36     (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

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

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

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

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

     17MB      (1) 4M x 36     (1) 256K x        None           None
                                   36

     17MB       (1) 256K x    (1) 2M x 36    (1) 2M x 36        None
                    36

     17MB       (1) 256K x    (1) 4M x 36        None           None
                    36

     18MB      (1) 4M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     18MB      (1) 4M x 36     (1) 512K x        None           None
                                   36

     20MB      (1) 4M x 36    (1) 1M x 36        None           None

     20MB      (1) 2M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     20MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        None

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

     24MB      (1) 2M x 36    (1) 4M x 36        None           None

     25MB       (1) 256K x    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36
                    36

     26MB       (1) 512K x    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36
                    36

     28MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     28MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36

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

     32MB      (1) 4M x 36    (1) 2M x 36    (1) 2M x 36        None

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

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

     33MB      (1) 8M x 36     (1) 256K x        None           None
                                   36

     33MB       (1) 256K x    (1) 8M x 36        None           None
                    36

     34MB      (1) 8M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     34MB      (1) 8M x 36     (1) 512K x        None           None
                                   36

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1         Bank 2         Bank 3

     34MB        (1) 512K x    (1) 4M x 36    (1) 4M x 36       None
                     36

     34MB        (1) 512K x    (1) 8M x 36       None           None
                     36

     35MB       (1) 8M x 36     (1) 256K x     (1) 256K x   (1) 256K x 36
                                   36             36

     36MB       (1) 8M x 36     (1) 512K x     (1) 512K x       None
                                   36             36

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

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

     38MB       (1) 8M x 36     (1) 512K x     (1) 512K x   (1) 512K x 36
                                   36             36

     40MB       (1) 8M x 36    (1) 1M x 36    (1) 1M x 36       None

     40MB       (1) 8M x 36    (1) 2M x 36       None           None

     40MB       (1) 4M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     40MB       (1) 2M x 36    (1) 4M x 36    (1) 4M x 36       None

     40MB       (1) 2M x 36    (1) 8M x 36       None           None

     48MB       (1) 8M x 36    (1) 4M x 36       None           None

     48MB       (1) 4M x 36    (1) 8M x 36       None           None

     49MB        (1) 256K x    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36
                     36

     50MB        (1) 512K x    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36
                     36

     52MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     56MB       (1) 8M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     56MB       (1) 2M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 8M x 36    (1) 4M x 36    (1) 4M x 36       None

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

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

     65MB        (1) 256K x    (1) 8M x 36    (1) 8M x 36       None
                     36

     66MB        (1) 512K x    (1) 8M x 36    (1) 8M x 36       None
                     36

     68MB       (1) 1M x 36    (1) 8M x 36    (1) 8M x 36       None

     72MB       (1) 2M x 36    (1) 8M x 36    (1) 8M x 36       None

     80MB       (1) 8M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

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

     97MB        (1) 256K x    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36
                     36

     98MB        (1) 512K x    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36
                     36

    100MB       (1) 1M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    104MB       (1) 2M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    112MB       (1) 4M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

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

  Note: Not all configurations are shown. Any SIMM can be installed in
  any bank.

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

   256KB (A)      (4) 64K x 8        None        (1) 32K x 8

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

     512KB       (4) 128K x 8        None        (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size             JP5                 JP6                 JP7

     128KB          Pins 1 & 2            Open                Open
                      closed

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

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

     512KB          Pins 1 & 2       Pins 1 & 2, 3 &    Pins 1 & 2, 3 & 4
                      closed            4 closed             closed

               CPU SPEED SELECTION

   Speed        JP15        JP16         JP17

   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

  100iMHz      Closed      Closed       Closed

  Note: JP17 may not be present on all boards.

                            CPU TYPE SELECTION

          Type             JP10     JP11       JP31       JP45     JP46

        UMC U5S           1 & 2     2 & 3      Open      2 & 3     Open

        CX486DX           2 & 3     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

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

   (SL)AM486DX(SV8B)      1 & 2     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

   (SL)AM486DX(SV8T)      1 & 2     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

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

        CX486DX2          2 & 3     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

        AM486DX2          1 & 2     1 & 2      Open      2 & 3,    1 & 2,
                                                         5 & 6     4 & 5

   (SL)AM486DX2(SV8B)     1 & 2     1 & 2      Open      1 & 2,    1 & 2,
                                                         4 & 5     4 & 5

   (SL)AM486DX2(SV8T)     1 & 2     1 & 2      Open      1 & 2,    1 & 2,
                                                         4 & 5     4 & 5

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

        CX486DX4          2 & 3     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

      (SL)CX486DX4        2 & 3     1 & 2     Closed     1 & 2     1 & 2,
                                                                   4 & 5

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

   (SL)AM486DX4(SV8B)     1 & 2     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

   (SL)AM486DX4(SV8T)     1 & 2     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

        80486DX4          1 & 2     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

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

          P24T            1 & 2     1 & 2      Open      1 & 2     2 & 3,
                                                                   4 & 5

         CX5X86           1 & 2     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

       AM5X86-P75         1 & 2     1 & 2      Open      1 & 2,    1 & 2,
                                                         4 & 5     4 & 5

      AM5X86-P75+         1 & 2     1 & 2      Open      1 & 2     1 & 2,
                                                                   4 & 5

       AM5X86-P90         1 & 2     1 & 2      Open      1 & 2,    1 & 2,
                                                         4 & 5     4 & 5

  Note: Pins designated should be in the closed position. Ver. 2 does not
  support the UMC U5S.

                             CPU TYPE SELECTION (CONT)

        Type             RN11         RN12         RN13         RN14         RN15

       UMC U5S         Installed       Not          Not          Not          Not
                                   installed    installed    installed    installed

       CX486DX            Not      Installed    Installed        Not          Not
                       installed                             installed    installed

       AM486DX            Not          Not          Not      Installed    Installed
                       installed   installed    installed

  (SL)AM486DX(SV8B)       Not          Not          Not      Installed    Installed
                       installed   installed    installed

  (SL)AM486DX(SV8T)       Not          Not          Not      Installed    Installed
                       installed   installed    installed

       80486DX            Not          Not          Not      Installed    Installed
                       installed   installed    installed

      CX486DX2            Not      Installed    Installed        Not          Not
                       installed                             installed    installed

      AM486DX2            Not          Not          Not      Installed    Installed
                       installed   installed    installed

  (SL)AM486DX2(SV8B)      Not          Not          Not      Installed    Installed
                       installed   installed    installed

  (SL)AM486DX2(SV8T)      Not          Not          Not      Installed    Installed
                       installed   installed    installed

      80486DX2            Not          Not          Not      Installed    Installed
                       installed   installed    installed

      CX486DX4            Not      Installed    Installed        Not          Not
                       installed                             installed    installed

    (SL)CX486DX4          Not          Not          Not      Installed    Installed
                       installed   installed    installed

      AM486DX4            Not          Not          Not      Installed    Installed
                       installed   installed    installed

  (SL)AM486DX4(SV8B)      Not          Not          Not      Installed    Installed
                       installed   installed    installed

  (SL)AM486DX4(SV8T)      Not          Not          Not      Installed    Installed
                       installed   installed    installed

      80486DX4            Not          Not          Not      Installed    Installed
                       installed   installed    installed

        P24D              Not          Not          Not      Installed    Installed
                       installed   installed    installed

        P24T              Not          Not          Not      Installed    Installed
                       installed   installed    installed

       CX5X86             Not          Not          Not      Installed    Installed
                       installed   installed    installed

     AM5X86-P75           Not          Not          Not      Installed    Installed
                       installed   installed    installed

     AM5X86-P75+          Not          Not          Not      Installed    Installed
                       installed   installed    installed

     AM5X86-P90           Not          Not          Not      Installed    Installed
                       installed   installed    installed

  Note: RN11 is not present on Ver. 2 Ver. 2 does not support the UMC U5S.

                           CPU VOLTAGE SELECTION

     Voltage             JP36               JP37               JP39

      3.45v            Pins 2 & 3        Pins 2 & 3         Pins 2 & 3
                        closed             closed             closed

        4v             Pins 2 & 3        Pins 1 & 2         Pins 2 & 3
                        closed             closed             closed

        5v             Pins 1 & 2        Pins 2 & 3         Pins 1 & 2
                        closed             closed             closed

                    DMA CHANNEL SELECTION

       Channel               JP8                  JP9

          1            Pins 1 & 2 closed   Pins 1 & 2 closed

          3            Pins 2 & 3 closed   Pins 2 & 3 closed

