
MECER CORPORATION

B830 (REV. B)

Processor        80486SX/80487SX/80486DX/80486DX2
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         Unidentified
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                  Location

  External battery          JP2       Turbo switch               JP15

  Reset switch              JP3       Turbo LED                  JP16

  Power LED & keylock       JP9       Auxiliary keyboard         JP104
                                      connector

  Speaker                  JP10       32-bit VESA local bus    SL1 & SL2
                                      slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JP5              N/A
      alter

     CMOS memory normal operation            JP6              Open

      CMOS memory clear                       JP6             Closed

              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) 256K x 9    (4) 1M x 9

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

      16MB        (4) 4M x 9         NONE

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

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

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     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         JP8A            JP8B           JP8D            JP8E

    64KB       pins 2 & 3     pins 2 & 3      pins 2 & 3      pins 2 & 3
                closed          closed         closed          closed

   128KB       pins 1 & 2     pins 1 & 2      pins 1 & 2      pins 1 & 2
                closed          closed         closed          closed

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

                          CPU TYPE CONFIGURATION

      Type           JP12          JP13           JP29           JP30

     80486SX      pins 2 & 3     pins 2 & 3    pins 2 & 3     pins 2 & 3
     (PQFP)         closed        closed         closed         closed

     80486SX      pins 2 & 3     pins 2 & 3    pins 1 & 2     pins 2 & 3
     (PGA)          closed        closed         closed         closed

    80487SX       pins 1 & 2     pins 1 & 2    pins 1 & 2     pins 2 & 3
                    closed        closed         closed         closed

     80486DX      pins 2 & 3     pins 2 & 3    pins 2 & 3     pins 2 & 3
     (PQFP)         closed        closed         closed         closed

     80486DX      pins 1 & 2     pins 1 & 2    pins 1 & 2     pins 1 & 2
     (PGA)          closed        closed         closed         closed

    80486DX2      pins 1 & 2     pins 1 & 2    pins 1 & 2     pins 1 & 2
                    closed        closed         closed         closed

                          CPU SPEED CONFIGURATION

      Speed              JP7A              JP8B               JP7C

      20MHz           pins 2 & 3         pins 1 & 2         pins 1 & 2
                        closed            closed             closed

      25MHz           pins 1 & 2         pins 2 & 3         pins 1 & 2
                        closed            closed             closed

      33MHz           pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

      40MHz           pins 2 & 3         pins 2 & 3         pins 1 & 2
                        closed            closed             closed

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

      50MHz           pins 2 & 3         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

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

      VESA WAIT STATE CONFIGURATION

     Wait states            JP102

    0 wait states     pins 1 & 2 closed

    1 wait state      pins 2 & 3 closed

         BUS SPEED CONFIGURATION

      CPU speed             JP103

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

                       VESA BUS DELAY CONFIGURATION

    Delay        JP105       JP106       JP107       JP108       JP109

    Normal        Open       Open      1 & 2 , 4     Open         Open
                                          & 5

   1 delay       1 & 2       Open       2 & 3, 4     1 & 2        Open
                                          & 5

   2 delays      2 & 3       1 & 2      1 & 2, 3     2 & 3       Closed
                                          & 4

   3 delays      2 & 3       2 & 3      1 & 2, 3     2 & 3       Closed
                                          & 4

  Note: Pins designated should be in the closed position.

                         VESA CARD CONFIGURATION

          Speed                   JP110                    JP111

  Normal card installed           Closed                   Closed

  Weitek card installed            Open                     Open

