
BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-8500TAC

Processor            Pentium
Processor Speed      75/90/100/120/133/150/166/180MHz
Chip Set             Unidentified
Maximum Onboard      128MB (EDO supported)
Memory
Maximum Video Memory None
Cache                256/512KB
BIOS                 AMI
Dimensions           275mm x 220mm
I/O Options          32-bit PCI slots (3), floppy drive interface, green PC
                     connector, IDE interfaces (2), parallel port, PS/2
                     mouse port, serial ports (2), VRM connector
NPU Options          None

[Image]

                                CONNECTIONS

       Function             Label           Function            Label

  Serial port 1              CN1       Reset switch           J8 pins 12
                                                                 & 13

  Parallel port              CN2       Green PC connector     J8 pins 17
                                                                 & 18

  Serial port 2              CN3       IDE interface LED      J8 pins 20
                                                                 & 21

  Floppy drive               CN4       VCC ground             J8 pins 25
  interface                            connector                 & 26

  IDE interface 2            CN5       PS/2 mouse port           J11

  IDE interface 1            CN6       Chassis fan power         JP19

  Speaker                J8 pins 1 -   32-bit PCI slots       PC1 - PC3
                              4

  Power LED & keylock    J8 pins 5 -   VRM connector             VRM
                              9

  Turbo LED               J8 pins 10
                            & 11

                        USER CONFIGURABLE SETTINGS

                 Setting                      Label          Position

     Jumper information unavailable           J12             N/A

     Jumper information unavailable           J13             N/A

     Jumper information unavailable          J21A             N/A

     Jumper information unavailable           JP2             N/A

     CMOS memory normal operation             JP4             Open

      CMOS memory clear                        JP4            Closed

      Flash BIOS voltage select 5v             JP5          Pins 1 & 2
                                                              closed

      Flash BIOS voltage select 12v            JP5          Pins 2 & 3
                                                              closed

      EPROM installed                          JP5             Open

      Secondary IDE IRQ select IRQ15           JP8          Pins 1 & 2
                                                              closed

      Secondary IDE IRQ select IRQ             JP8          Pins 2 & 3
      through PCI                                             closed

     Primary IDE IRQ14 enabled                JP9            Closed

      Primary IDE IRQ14 disabled               JP9             Open

     Jumper information unavailable          JP12             N/A

     Jumper information unavailable          JP13             N/A

     Factory configured - do not alter       JP22          Pins 2 & 3
                                                              closed

     Jumper information unavailable          JP30             N/A

     Jumper information unavailable          JP31             N/A

     Jumper information unavailable          JP32             N/A

             DRAM CONFIGURATION

     Size          Bank 0        Bank 1

      8MB        (2) 1M x 36      None

     16MB        (2) 2M x 36      None

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

     24MB        (2) 2M x 36   (2) 1M x 36

     24MB        (2) 1M x 36   (2) 2M x 36

     32MB        (2) 4M x 36      None

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

            DRAM CONFIGURATION (CONT)

      Size            Bank 0           Bank 1

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

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

      48MB         (2) 4M x 36      (2) 2M x 36

      48MB         (2) 2M x 36      (2) 4M x 36

      64MB         (2) 8M x 36          None

      64MB         (2) 4M x 36      (2) 4M x 36

      66MB         (2) 8M x 36     (2) 256K x 36

      66MB        (2) 256K x 36     (2) 8M x 36

      68MB         (2) 8M x 36     (2) 512K x 36

      68MB        (2) 512K x 36     (2) 8M x 36

      72MB         (2) 8M x 36      (2) 1M x 36

      72MB         (2) 1M x 36      (2) 8M x 36

      80MB         (2) 8M x 36      (2) 2M x 36

      80MB         (2) 2M x 36      (2) 8M x 36

      96MB         (2) 8M x 36      (2) 4M x 36

      96MB         (2) 4M x 36      (2) 8M x 36

      128MB        (2) 8M x 36      (2) 8M x 36

  Note: Board accepts EDO memory.

                            CACHE CONFIGURATION

       Size             Bank 0           Bank 1               TAG

     256KB (A)           None         (2) 32K x 32           None

     256KB (B)       (8) 32K x 8          None        (1) 8K/16K/32K x 8

     512KB (A)       (8) 64K x 8          None          (1) 16K/32K x 8

     512KB (B)       (8) 64K x 8          None            (1) 16K x 8

  Note: Board will either have asynchronous or synchronous cache
  installed.

                CACHE JUMPER CONFIGURATION

            Size                         JP10

            None                         Open

  256KB (B) (STD/Aster TAG)              Open

     512KB (A) (STD TAG)          Pins 1 & 2 closed

    512KB (B) (Aster TAG)         Pins 2 & 3 closed

                    CPU SPEED SELECTION

  Speed       JP6       JP7       JP15      JP16      JP21

  75MHz      Open      Open       Open      Open     1 & 2

  90MHz      Open     Closed      Open      Open     2 & 3

  100MHz    Closed    Closed      Open      Open     2 & 3

  120MHz     Open     Closed     Closed     Open     2 & 3

  133MHz    Closed    Closed     Closed     Open     2 & 3

  150MHz     Open     Closed     Closed    Closed    2 & 3

  166MHz    Closed    Closed     Closed    Closed    2 & 3

  180MHz     Open     Closed      Open     Closed    2 & 3

  Note: Pins designated should be in the closed position.

                   CPU TYPE SELECTION

            Type                       JP20

       P54C/CS/CQS/CT        Pins 1 & 2, 3 & 4 closed

            P55C                       Open

          CPU VOLTAGE SELECTION

       Voltage               JP27

        3.4v          Pins 1 & 2 closed

        3.5v          Pins 2 & 3 closed

                        SERIAL PORT 2 SELECTION

        Setting                  JP35                    JP36

     Used as COM2/4        Pins 1 & 2 closed       Pins 1 & 2 closed

  Used as IR connector     Pins 2 & 3 closed       Pins 2 & 3 closed

