
MECER CORPORATION

B880

Processor    SL80486SX/80486SX/CX486DX/SL80486DX/80486DX/SL80486DX2/
             80486DX2/P24D/Pentium Overdrive
Processor    25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set     Contaq
Max. Onboard 128MB
DRAM
Cache        128/256/512/1024KB
BIOS         Unidentified
Dimensions   330mm x 218mm
I/O Options  32-bit VESA local bus slots (2), 32-bit PCI slots (3), green
             PC connector
NPU Options  None

[Image]

                                CONNECTIONS

  Purpose                 Location      Purpose               Location

  Auxiliary keyboard        JP1         Turbo LED          JP59 pins 11 -
  connector                                                      12

  External battery          JP3         Green PC LED       JP59 pins 13 -
                                                                 14

  External battery          JP4         Turbo switch       JP59 pins 16 -
                                                                 17

  Green PC connector        JP6         Reset switch       JP59 pins 19 -
                                                                 20

  Power LED & keylock   JP59 pins 1 -   32-bit PCI slots     PC1 - PC3
                             4

  Speaker               JP59 pins 7 -   32-bit VESA          SL1 & SL2
                             10         local bus slots

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CMOS memory normal operation            JP2           pins 1 & 2
                                                              closed

      CMOS memory clear                       JP2           pins 2 & 3
                                                              closed

     PQFP CPU disabled                      JP33             Closed

      PQFP CPU enabled                       JP33              Open

     PCI clock delay select 1 delay         JP43           pins 1 & 2
                                                              closed

      PCI clock delay select 3 delays        JP43           pins 2 & 3
                                                              closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       1MB         (4) 256K x 9         NONE

       2MB         (4) 256K x 9    (1) 256K x 36

       2MB        (1) 256K x 36     (4) 256K x 9

       4MB          (4) 1M x 9          NONE

       5MB         (4) 256K x 9     (1) 1M x 36

       5MB         (1) 1M x 36      (4) 256K x 9

       8MB          (4) 1M x 9      (1) 1M x 36

       8MB         (1) 1M x 36       (4) 1M x 9

      16MB          (4) 4M x 9          NONE

      17MB         (4) 256K x 9     (1) 4M x 36

      17MB         (1) 4M x 36      (4) 256K x 9

      20MB          (4) 1M x 9      (1) 4M x 36

      20MB         (1) 4M x 36       (4) 1M x 9

      32MB          (4) 4M x 9      (1) 4M x 36

      32MB         (1) 4M x 36       (4) 4M x 9

      64MB         (4) 16M x 9          NONE

      65MB         (4) 256K x 9     (1) 16M x 36

      65MB         (1) 16M x 36     (4) 256K x 9

      68MB          (4) 1M x 9      (1) 16M x 36

      68MB         (1) 16M x 36      (4) 1M x 9

      80MB          (4) 4M x 9      (1) 16M x 36

      80MB         (1) 16M x 36      (4) 4M x 9

      128MB        (4) 16M x 9      (1) 16M x 36

      128MB        (1) 16M x 36     (4) 16M x 9

                         DRAM JUMPER CONFIGURATION

           Type                     JP10                    JP11

  Bank 0 = 30-pin & Bank     pins 1 & 2 closed       pins 2 & 3 closed
        1 = 72-pin

  Bank 0 = 72-pin & Bank     pins 2 & 3 closed       pins 1 & 2 closed
        1 = 30-pin

  Bank 0/1 = double side            Open              pins 1 & 2, 3 & 4
          72-pin                                           closed

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

     128KB        (4) 32K x 8        NONE         (1) 8K x 8

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

     256KB        (4) 64K x 8        NONE        (1) 64K x 8

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

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

      1MB        (4) 128K x 8    (4) 128K x 8    (1) 128K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP49               JP50               JP51

      128KB           pins 1 & 2        pins 2 & 3            Open
                       closed             closed

      256KB           pins 1 & 2        pins 1 & 2            Open
                       closed             closed

      256KB           pins 1 & 2        pins 2 & 3            Open
                       closed             closed

      512KB           pins 2 & 3           Open         pins 1 & 2 closed
                       closed

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

       1MB            pins 2 & 3           Open         pins 2 & 3 closed
                       closed

                          CPU TYPE CONFIGURATION

        Type             JP35         JP36         JP41          JP52

       80486SX           1 & 2        Open         1 & 2       1 & 2, 3 &
                                                                   4

      SL80486SX          2 & 3        Open         1 & 2         2 & 3

       CX486DX           2 & 3        1 & 2        2 & 3       1 & 2, 3 &
                                                                   4

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

      SL80486DX          2 & 3        Open         1 & 2       1 & 2, 3 &
                                                                   4

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

     SL80486DX2          2 & 3        Open         1 & 2       1 & 2, 3 &
                                                                   4

      P24D (WB)          2 & 3        2 & 3        1 & 2       1 & 2, 3 &
                                                                   4

      P24D (WT)          2 & 3        2 & 3        1 & 2       1 & 2, 3 &
                                                                   4

  Pentium Overdrive      2 & 3        1 & 2        1 & 2       1 & 2, 3 &
        (WB)                                                       4

  Pentium Overdrive      2 & 3        1 & 2        1 & 2       1 & 2, 3 &
        (WT)                                                       4

  Note: WB = write back & WT = write through. Pins designated should be
  in the closed position.

                          CPU TYPE CONFIGURATION

        Type             JP53         JP55         JP56          JP57

       80486SX           Open         Open         Open          Open

      SL80486SX          1 & 2        Open       3 & 4, 5 &      Open
                                                     6

       CX486DX           2 & 3        2 & 3        4 & 5         5 & 6

       80486DX           Open         2 & 3        Open          Open

      SL80486DX          1 & 2        2 & 3      3 & 4, 5 &      Open
                                                     6

      80486DX2           Open         2 & 3        Open          Open

     SL80486DX2          1 & 2        2 & 3      3 & 4, 5 &      Open
                                                     6

      P24D (WB)        1 & 2, 3 &     2 & 3      3 & 4, 5 &    2 & 3, 4 &
                           4                         6             5

      P24D (WT)        1 & 2, 3 &     2 & 3      3 & 4, 5 &    1 & 2, 4 &
                           4                         6             5

  Pentium Overdrive      1 & 2        1 & 2        5 & 6         3 & 4
        (WB)

  Pentium Overdrive      1 & 2        1 & 2        5 & 6         1 & 2
        (WT)

  Note: WB = write back & WT = write through. Pins designated should be
  in the closed position.

                  CPU SPEED CONFIGURATION

  Speed      JP17      JP22       JP39      JP40      JP47

  25MHz     Closed    Closed     1 & 2     2 & 3     2 & 3

  33MHz     Closed     Open      2 & 3     1 & 2     2 & 3

  40MHz      Open      Open      1 & 2     2 & 3     1 & 2

  50iMHz    Closed    Closed     1 & 2     2 & 3     2 & 3

  50MHz      Open      Open      2 & 3     1 & 2     1 & 2

  66iMHz    Closed     Open      2 & 3     1 & 2     2 & 3

  Note: Pins designated should be in the closed position.

  VESA WAIT STATE CONFIGURATION

   Wait states         JP60

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed        JP61

   <= 33MHz        Open

   > 33MHz        Closed

            PCI IRQ CONFIGURATION (IRQ3)

           IRQ                      JP10A

    IRQ3 PCI compliant        pins 1 & 2 closed

  IRQ3 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ4)

           IRQ                      JP10B

    IRQ4 PCI compliant        pins 1 & 2 closed

  IRQ4 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ5)

           IRQ                      JP10C

    IRQ5 PCI compliant        pins 1 & 2 closed

  IRQ5 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ7)

           IRQ                      JP10D

    IRQ7 PCI compliant        pins 1 & 2 closed

  IRQ7 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ10)

            IRQ                      JP10E

    IRQ10 PCI compliant        pins 1 & 2 closed

  IRQ10 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ11)

            IRQ                      JP10F

    IRQ11 PCI compliant        pins 1 & 2 closed

  IRQ11 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ12)

            IRQ                      JP10G

    IRQ12 PCI compliant        pins 1 & 2 closed

  IRQ12 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ15)

            IRQ                      JP10H

    IRQ15 PCI compliant        pins 1 & 2 closed

  IRQ15 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ9)

           IRQ                      JP10I

    IRQ9 PCI compliant        pins 1 & 2 closed

  IRQ9 PCI non compliant      pins 2 & 3 closed

            PCI IRQ CONFIGURATION (IRQ6)

           IRQ                      JP10J

    IRQ6 PCI compliant        pins 1 & 2 closed

  IRQ6 PCI non compliant      pins 2 & 3 closed

                       PCI IRQ CONFIGURATION (IRQ14)

                  IRQ                                 JP10K

          IRQ14 PCI compliant                   pins 1 & 2 closed

    IRQ14 PCI non compliant (1 card             pins 2 & 3 closed
              installed)

    IRQ14 PCI non compliant (2 cards            pins 2 & 4 closed
              installed)

                   PCI COMPLIANCE CONFIGURATION

              Slot                              JP7

        Slot 1 compliant                 pins 1 & 2 closed

      Slot 1 non-compliant               pins 2 & 3 closed

        Slot 2 compliant                 pins 4 & 5 closed

      Slot 2 non-compliant               pins 5 & 6 closed

        Slot 3 compliant                 pins 7 & 8 closed

      Slot 3 non-compliant               pins 8 & 9 closed

     Slot 3 non-compliant *             pins 11 & 12 closed

  Note: * Slot 3 has a second non-compliant PCI card installed.

