
BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-1433/1440/1450 UCV-A

Processor   CX486S/80486SX/80487SX/AMD80486DX/80486DX/ODP486SX/80486DX2/
            Pentium Overdrive
Processor   20/25/33/40(internal)/50(internal)/50/66(internal)MHz
Speed
Chip Set    VLSI
Max.        64MB
Onboard
DRAM
Cache       32/64/128/256KB
BIOS        AMI
Dimensions  330mm x 218mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  Speaker                   J1         Turbo switch              J5

  Power LED &               J2         5v DC ground              J6
  keylock

  Turbo LED                 J3         External battery          JP8

  Reset switch              J4         32-bit VESA Local    SL1, SL2, SL3
                                       bus slots

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

      CMOS memory normal operation           JP8           pins 2 & 3
                                                              closed

       CMOS memory clear                      JP8           pins 3 & 4
                                                              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 PGA or PQFP on        JP12           pins 2 & 3
       board                                                  closed

       CPU type select PQFP and PGA on       JP12           pins 1 & 2
       board - disables PQFP                                  closed

      Monitor type select monochrome        JP14           pins 1 & 2
                                                              closed

       Monitor type select color             JP14           pins 2 & 3
                                                              closed

      Weitek Power 9000 VGA card not        JP28           pins 1 & 2
       installed                                              closed

       Weitek Power 9000 VGA card            JP28           pins 2 & 3
       installed                                              closed

  Note: External battery and CMOS memory configuration share the same
  jumper. Pins 2 & 3 on JP8 must be closed in order for system to
  function This is done with either a jumper or external battery
  installed.

              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

                    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      (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      1 & 2     1 & 2     Closed    Closed    2 & 3

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

            Type                     JP16                    JP17

       80486SX/CX486S          pins 1 & 2 closed      pins 2 & 3 closed

     80487SX/ODP80486SX        pins 2 & 3 closed       pins 1 & 2, 3 & 4
                                                            closed

        80486DX/DX2            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

  50MHz      Open     Closed     Open     Closed

  50iMHz    Closed     Open     Closed     Open

  66iMHz    Closed    Closed     Open      Open

                         VESA CLOCK CONFIGURATION

       Mode         JP25 (SL2)    JP26 (SL1)    JP29 (SL3)    JP30 (SL2 &
                                                                 SL3)

    Synchronous      pins 1 & 2    pins 1 & 2   pins 1 & 2     pins 1 & 2
                      closed        closed        closed        closed

   Asynchronous      pins 2 & 3    pins 2 & 3   pins 2 & 3     pins 2 & 3
                      closed        closed        closed        closed

  Note: If pins 1 & 2 are closed on JP30, JP25 must remain open.

                       VESA BUS SPEED CONFIGURATION

         Mode                     JP19                       JP20

     Synchronous            pins 2 & 3 closed         pins 1 & 2 closed

     Asynchronous           pins 1 & 2 closed          pins 2 & 3 closed
                           (40MHz/50MHz only)            (50MHz only)

               VESA BUS CONFIGURATION (CIRRUS LOGIC VER. AB)

       Mode                   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

      50iMHz            pins 2 & 3 closed           pins 1 & 2 closed

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

  Note: These settings are used only if a Cirrus Logic version AB video
  card is installed.

               VESA BUS CONFIGURATION (CIRRUS LOGIC VER. AC)

       Mode                   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

      50iMHz            pins 2 & 3 closed           pins 1 & 2 closed

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

  Note: These settings are used only if a Cirrus Logic version AC video
  card is installed.

