
BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-8433AEP

Processor  80486SX/CX486M7/CX486DX/AM486DX/AM486DX PLUS/UMC U5/80486DX/
           CX486DX2/AM486DX2/AM486DX2 PLUS/80486DX2/AM486DX4/80486DX4/ SL Pentium
           Overdrive/Cyrix M1
Processor  25/33/40/66(internal)/75(internal)/80(internal)/100(internal)/120(internal)MHz
Speed
Chip Set   AMD
Max.       64MB
Onboard
DRAM
Cache      128/256/512KB
BIOS       AMI
Dimensions 220mm x 210mm
I/O        PS/2 mouse port, parallel port, serial ports (2), 32-bit PCI slots (3), floppy
Options    drive interface, IDE interfaces (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location      Purpose               Location

  Floppy drive               J4         Turbo LED          J12 (pins 10 &
  interface                                                     11)

  IDE interface              J5         Reset switch       J12 (pins 12 &
  (primary)                                                     13)

  Serial port 2              J6         Green PC           J12 (pins 17 -
                                        connector               19)

  IDE interface              J8         IDE interface      J12 (pins 20 -
  (secondary)                           LED                     22)

  Serial port 1              J9         Turbo switch       J12 (pins 23 &
                                                                24)

  Parallel port              J10        Chassis fan             JP2
                                        power

  External battery           J11        32-bit PCI slots    PCI1 - PCI3

  Speaker               J12 (pins 1 -   PS/2 mouse port          S1
                             4)

  Power LED & keylock   J12 (pins 5 -
                             9)

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation            J11           pins 2 & 3
                                                              closed

      CMOS memory clear                       J11           pins 3 & 4
                                                              closed

     Factory configured - do not             J13              N/A
      alter

      Flash BIOS voltage select 5v            JP22          pins 2 & 3
                                                              closed

      Flash BIOS voltage select 12v           JP22          pins 1 & 2
                                                              closed

      Flash BIOS EPROM                        JP22             Open

     Internal battery enabled                JP25            Closed

      Internal battery disabled               JP25             Open

     Power good signal detect from           JP26          pins 1 & 2
      power supply                                            closed

      Power good signal detect from           JP26          pins 2 & 3
      board                                                   closed

     Factory configured - do not              U2              N/A
      alter

     Factory configured - do not              U3              N/A
      alter

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

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

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

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

      4MB       (1) 2M x 36    (1) 2M x 36       NONE           NONE

      4MB           NONE          NONE        (1) 2M x 36    (1) 2M x 36

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

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

      6MB       (1) 2M x 36    (1) 4M x 36       NONE           NONE

      6MB           NONE          NONE        (1) 2M x 36    (1) 4M x 36

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

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

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

     10MB       (1) 2M x 36    (1) 8M x 36       NONE           NONE

     10MB           NONE          NONE        (1) 2M x 36    (1) 8M x 36

     12MB       (1) 4M x 36    (1) 8M x 36       NONE           NONE

     12MB           NONE          NONE        (1) 4M x 36    (1) 8M x 36

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

     16MB       (1) 8M x 36    (1) 8M x 36       NONE           NONE

     16MB           NONE          NONE        (1) 8M x 36    (1) 8M x 36

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

     18MB       (1) 2M x 36    (1) 16M x 36      NONE           NONE

     18MB           NONE          NONE        (1) 2M x 36   (1) 16M x 36

     20MB       (1) 4M x 36    (1) 16M x 36      NONE           NONE

     20MB           NONE          NONE        (1) 4M x 36   (1) 16M x 36

     24MB       (1) 8M x 36    (1) 16M x 36      NONE           NONE

     24MB           NONE          NONE        (1) 8M x 36   (1) 16M x 36

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

     33MB       (1) 1M x 36    (1) 32M x 36      NONE           NONE

     33MB           NONE          NONE        (1) 1M x 36   (1) 32M x 36

     34MB       (1) 2M x 36    (1) 32M x 36      NONE           NONE

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1         Bank 2         Bank 3

     34MB           NONE          NONE        (1) 2M x 36   (1) 32M x 36

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

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

     40MB       (1) 8M x 36    (1) 32M x 36      NONE           NONE

     40MB           NONE          NONE        (1) 8M x 36   (1) 32M x 36

     48MB       (1) 16M x 36   (1) 32M x 36      NONE           NONE

     48MB           NONE          NONE        (1) 16M x 36  (1) 32M x 36

     64MB       (1) 32M x 36   (1) 32M x 36      NONE           NONE

     64MB           NONE          NONE        (1) 32M x 36  (1) 32M x 36

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     128KB       (4) 32K x 8   (1) 8K x 8

   256KB (A)     (4) 64K x 8   (1) 16K x 8

   256KB (B)     (4) 64K x 8   (1) 32K x 8

     512KB       (4) 64K x 8   (1) 32K x 8

                  CACHE JUMPER CONFIGURATION

        Size                 JP20                 JP21

        128KB          pins 1 & 2 closed          Open

      256KB (A)              Open          pins 1 & 2 closed

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

        512KB          pins 2 & 3 closed   pins 2 & 3 closed

                          CPU TYPE CONFIGURATION

       Type             JP5           JP6          JP7           JP8

      80486SX          5 & 6          Open      2 & 3, 4 &       Open
                                                    5

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

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

  AM486DX PLUS WB    1 & 2, 4 &       Open        1 & 2          Open
                         5

  AM486DX PLUS WT    1 & 2, 4 &      5 & 6      1 & 2, 4 &       Open
                         5                          5

        U5              Open          Open        4 & 5          Open

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

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

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

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

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

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

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

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

  AM486DX4 PLUS WB   1 & 2, 4 &       Open        1 & 2          Open
                         5

  AM486DX2 PLUS WT   1 & 2, 4 &      5 & 6      1 & 2, 4 &       Open
                         5                          5

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

                      CPU TYPE CONFIGURATION (CONT)

      Type            JP5            JP6           JP7            JP8

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

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

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

     Type          RN6            RN7             RN8            RN9

   80486SX          Not        Installed          Not         Installed
                installed                      installed

   CX486DX          Not            Not         Installed    Not installed
                installed      installed

   AM486DX          Not        Installed          Not         Installed
                installed                      installed

    AM486DX         Not        Installed          Not         Installed
   PLUS WB      installed                      installed

    AM486DX         Not        Installed          Not           1 - 4
   PLUS WT      installed                      installed      installed
                                                                only

      U5        Installed          Not            Not       Not installed
                               installed       installed

   80486DX          Not        Installed          Not         Installed
                installed                      installed

   CX486DX2         Not            Not         Installed    Not installed
                installed      installed

   AM486DX2         Not        Installed          Not         Installed
                installed                      installed

   AM486DX2         Not        Installed          Not         Installed
   PLUS WB      installed                      installed

   AM486DX2         Not        Installed          Not           1 - 4
   PLUS WT      installed                      installed      installed
                                                                only

   80486DX2         Not        Installed          Not         Installed
                installed                      installed

   CX486DX4         Not            Not         Installed    Not installed
                installed      installed

   AM486DX4         Not        Installed          Not         Installed
                installed                      installed

   AM486DX4         Not        Installed          Not         Installed
   PLUS WB      installed                      installed

   AM486DX4         Not        Installed          Not           1 - 4
   PLUS WT      installed                      installed      installed
                                                                only

   80486DX4         Not        Installed          Not         Installed
                installed                      installed

     P24D           Not        Installed          Not         Installed
                installed                      installed

      M1            Not        Installed          Not           1 - 4
                installed                      installed      installed
                                                                only

  Note: Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

     Speed           JP11           JP16          JP18           JP19

     25MHz        pins 1 & 2        Open          Open           Open
                    closed

     33MHz        pins 1 & 2        Open         Closed         Closed
                    closed

     40MHz        pins 2 & 3       Closed         Open          Closed
                    closed

    66iMHz        pins 1 & 2        Open         Closed         Closed
                    closed

    75iMHz        pins 1 & 2        Open          Open           Open
                    closed

    80iMHz        pins 2 & 3       Closed         Open          Closed
                    closed

    100iMHz       pins 1 & 2        Open         Closed         Closed
                    closed

    120iMHz       pins 2 & 3       Closed         Open          Closed
                    closed

                         CPU VOLTAGE CONFIGURATION

      Voltage              JP1               JP3               JP4

       3.45v            pins 2 & 3          Open               Open
                         closed

        4v              pins 1 & 2          Open               Open
                         closed

        5v              pins 2 & 3         Closed             Closed
                         closed

                      DMA CONFIGURATION

         DMA                 JP9                  JP10

        DMA 1          pins 1 & 2 closed   pins 2 & 3 closed

        DMA 3          pins 2 & 3 closed   pins 1 & 2 closed

