
PIONEX TECHNOLOGIES, INC.

MB-8500TAC-A (VER. 5)

Processor          CX M1/AM K5/Pentium
Processor Speed    66/75/90/100/120/133/150/166/180/200MHz
Chip Set           Unidentified
Video Chip Set     None
Maximum Onboard    128MB (EDO supported)
Memory
Maximum Video      None
Memory
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, PS/2 mouse interface, serial ports (2), IR
                   connectors (2)
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  Serial port 1             CN1        Green PC connector    J8 pins 17 &
                                                                 18

  Parallel port             CN2        IDE interface LED     J8 pins 20 &
                                                                 21

  Serial port 2             CN3        VCC ground            J8 pins 25 &
                                       connector                 26

  Floppy drive              CN4        PS/2 mouse port           J11
  interface

  IDE interface 2           CN5        IR connector              J12

  IDE interface 1           CN6        IR connector             J12A

  Speaker              J8 pins 1 - 4   PS/2 mouse                J13
                                       interface

  Power LED &          J8 pins 5 - 9   Chassis fan power        JP19
  keylock

  Turbo LED             J8 pins 10 &   32-bit PCI slots       PC1 - PC3
                            11

  Reset switch          J8 pins 12 &
                            13

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           JP2          Unidentified
      alter

     CMOS memory normal operation          JP4              Open

      CMOS memory clear                     JP4             Closed

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

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

      BIOS type select EPROM                JP5              Open

      Secondary IDE IRQ select IRQ15        JP8        Pins 1 & 2 closed

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

      Primary IDE IRQ14 enabled             JP9             Closed

      Primary IDE IRQ14 disabled            JP9              Open

     Factory configured - do not          JP12          Unidentified
      alter

     Factory configured - do not          JP13          Unidentified
      alter

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

     Factory configured - do not          JP30        Pins 1 & 2 closed
      alter

     Factory configured - do not          JP32          Unidentified
      alter

             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) 1M x 36   (2) 2M x 36

     32MB        (2) 4M x 36      None

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

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

         DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1

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

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

   CPU      Clock    Multiplier    JP6      JP7     JP15    JP16     JP21
  speed    speed

  120MHz   50MHz        2x        Open      Open    Open    Closed    1 &
                                                                      2

  133MHz   55MHz        2x        Open     Closed   Open    Closed    1 &
                                                                      2

  150MHz   60MHz        2x        Closed   Closed   Open    Closed    2 &
                                                                      3

  166MHz   66MHz        2x        Closed    Open    Open    Closed    2 &
                                                                      3

  Note: Pins designated should be in the closed position.

                         CPU SPEED SELECTION (AMD)

   CPU      Clock    Multiplier    JP6      JP7     JP15    JP16     JP21
  speed    speed

  75MHz    66MHz        1x        Closed    Open    Open    Closed    2 &
                                                                      3

  75MHz    50MHz       1.5x       Open      Open    Open    Open      1 &
                                                                      2

  90MHz    55MHz       1.5x       Open     Closed   Open    Open      2 &
                                                                      3

  90MHz    60MHz       1.5x       Closed   Closed   Open    Open      2 &
                                                                      3

  100MHz   66MHz       1.5x       Closed    Open    Open    Open      2 &
                                                                      3

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (INTEL)

   CPU     Clock    Multiplier    JP6      JP7     JP15     JP16     JP21
  speed    speed

  75MHz    50MHz      1.5x       Open     Open     Open     Open      1 &
                                                                      2

  90MHz    60MHz      1.5x       Closed   Closed   Open     Open      2 &
                                                                      3

  100MHz   66MHz      1.5x       Closed   Open     Open     Open      2 &
                                                                      3

  120MHz   60MHz       2x        Closed   Closed   Open     Closed    2 &
                                                                      3

  133MHz   66MHz       2x        Closed   Open     Open     Closed    2 &
                                                                      3

  150MHz   60MHz      2.5x       Closed   Closed   Closed   Closed    2 &
                                                                      3

  166MHz   66MHz      2.5x       Closed   Open     Closed   Closed    2 &
                                                                      3

  180MHz   60MHz       3x        Closed   Closed   Closed   Open      2 &
                                                                      3

  200MHz   66MHz       3x        Closed   Open     Closed   Open      2 &
                                                                      3

  Note: Pins designated should be in the closed position.

                            CPU TYPE SELECTION

        Type                JP20              JP23             JP24

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

        AM K5          Pins 1 & 2, 3 &     Pins 1 & 2          Open
                          4 closed           closed

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

       P55C/CT              Open           Pins 2 & 3         Closed
                                             closed

  CPU VOLTAGE SELECTION

   Voltage       JP27

    3.4v        Closed

    3.5v         Open

                        SERIAL PORT 2 SELECTION

        Setting                  JP35                    JP36

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

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

