
PIONEX TECHNOLOGIES, INC.

MB-8500TUC

Processor            CX M1/AM K5/Pentium
Processor Speed      75/90/100/120/133/150/166/180MHz
Chip Set             Unidentified
Video Chip Set       None
Maximum Onboard      128MB (EDO supported)
Memory
Maximum Video Memory None
Cache                256/512KB
BIOS                 AMI
Dimensions           290mm x 220mm
I/O Options          32-bit PCI slots (4), floppy drive interface, green PC
                     connector, IDE interfaces (2), parallel port, PS/2
                     mouse port, PS/2 mouse interface, serial ports (2),
                     cache slot, IR connector, USB connector
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                 Location

  PS/2 mouse               J1         Power LED & keylock    J13 pins 5 -
  interface                                                       9

  Floppy drive             J2         Turbo LED             J13 pins 10 &
  interface                                                      11

  Serial port 1            J5         Reset switch          J13 pins 12 &
                                                                 13

  Serial port 2            J6         Green PC connector    J13 pins 17 &
                                                                 18

  PS/2 mouse port          J7         IDE interface LED     J13 pins 20 &
                                                                 21

  Parallel port            J9         +5v ground            J13 pins 25 &
                                                                 26

  IDE interface 1          J10        IR connector               J14
                                      (optional)

  IDE interface 2          J11        32-bit PCI slots        PC1 - PC4

  Chassis fan power        J12        Cache slot                 SL1

  Speaker               J13 pins 1    USB connector              USB
                           - 4

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           JP1          Unidentified
      alter

      Flash BIOS voltage select 12v        JP10        Pins 1 & 2 closed

      Flash BIOS voltage select 5v         JP10        Pins 2 & 3 closed

      EPROM or 0v flash BIOS used          JP10              Open

     CMOS memory normal operation         JP11              Open

      CMOS memory clear                    JP11             Closed

                            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

          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. Bank 2 uses DIMM modules. The
            chip size and configuration is unidentified.

                            CACHE CONFIGURATION

    Size        Bank 0       Bank 1         TAG               SL1

    256KB      (2) 32K x      None       (1) 8K x 8      Not installed
                  32

  512KB (A)    (2) 32K x    (2) 32K x     (1) 32K x      Not installed
                  32           32            8

  512KB (B)    (2) 32K x      None       (1) 8K x 8       256KB module
                  32                                       installed

  CACHE JUMPER CONFIGURATION

     Size            JP5

     256KB           Open

   512KB (A)        Closed

   512KB (B)        Closed

                        CPU SPEED SELECTION (CYRIX)

  CPU speed       Clock      Multiplier          JP4             JP7
                 speed

   100MHz        50MHz           2x        Pins 1 & 2, 3 &       Open
                                              4 closed

   110MHz        55MHz           2x             Open             Open

   120MHz        60MHz           2x           Pins 3 & 4         Open
                                               closed

   133MHz        66MHz           2x           Pins 1 & 2         Open
                                               closed

                         CPU SPEED SELECTION (AMD)

  CPU speed      Clock      Multiplier         JP4              JP7
                 speed

    66MHz        66MHz          1x          Pins 1 & 2       Pins 1 & 2
                                             closed            closed

    75MHz        50MHz         1.5x       Pins 1 & 2, 3         Open
                                           & 4 closed

    83MHz        55MHz         1.5x           Open              Open

    90MHz        60MHz         1.5x         Pins 3 & 4          Open
                                             closed

   100MHz        66MHz         1.5x         Pins 1 & 2          Open
                                             closed

                        CPU SPEED SELECTION (INTEL)

  CPU speed      Clock      Multiplier         JP4              JP7
                 speed

    75MHz        50MHz         1.5x       Pins 1 & 2, 3         Open
                                           & 4 closed

    90MHz        60MHz         1.5x         Pins 3 & 4          Open
                                             closed

   100MHz        66MHz         1.5x         Pins 1 & 2          Open
                                             closed

   120MHz        60MHz          2x          Pins 3 & 4       Pins 1 & 2
                                             closed            closed

   133MHz        66MHz          2x          Pins 1 & 2       Pins 1 & 2
                                             closed            closed

   150MHz        60MHz         2.5x         Pins 3 & 4      Pins 1 & 2, 3
                                             closed          & 4 closed

   166MHz        66MHz         2.5x         Pins 1 & 2      Pins 1 & 2, 3
                                             closed          & 4 closed

   180MHz        60MHz          3x          Pins 3 & 4       Pins 3 & 4
                                             closed            closed

                            CPU TYPE SELECTION

          Type                JP6              JP9             JP15

         Cyrix            1 & 2, 4 & 5    2 & 3, 4 & 5,        Open
                                          7 & 8, 9 & 10

          AMD             1 & 2, 4 & 5    2 & 3, 4 & 5,        Open
                                          7 & 8, 9 & 10

   Intel P54C/CQS/CT      1 & 2, 4 & 5    2 & 3, 4 & 5,        Open
                                          7 & 8, 9 & 10

     Intel P55C/CT        2 & 3, 5 & 6    1 & 2, 3 & 4,       Closed
                                          6 & 7, 8 & 9

  Note: Pins designated should be in the closed position.

  CPU VOLTAGE SELECTION

   Voltage       JP14

    3.4v        Closed

     3.5         Open

