
MICRONICS COMPUTERS, INC.

EISA-3 SYSTEM BOARD

Processor        80486SX/80486DX/ODP486SX/80486DX2
Processor Speed  25/33/50(internal)/50/66(internal)MHz
Chip Set         Micronics
Max. Onboard DRAM64MB
Cache            64/128/256/512KB
BIOS             Phoenix
Dimensions       330mm x 218mm
I/O Options      None
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  External battery           J3       Power LED & keylock         J11

  Turbo LED                  J5       Speaker                     J13

  Turbo switch               J8       External keyboard           J23
                                      connector

  Reset switch               J9

                                     USER CONFIGURABLE SETTINGS

                         Function                          Jumper                  Position

          Monitor type select color                        J12                     Closed

           Monitor type select monochrome                   J12                      Open

          Factory configured - do not alter                J25                      Open

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2         Bank 3

      4MB       (1) 1M x 36        NONE          NONE           NONE

      8MB       (1) 1M x 36    (1) 1M x 36       NONE           NONE

     12MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36       NONE

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

     16MB       (1) 4M x 36        NONE          NONE           NONE

     20MB       (1) 1M x 36    (1) 4M x 36       NONE           NONE

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36       NONE

     32MB       (1) 4M x 36    (1) 4M x 36       NONE           NONE

     36MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36       NONE

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

     48MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36       NONE

     64MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

                            CACHE CONFIGURATION

  Size     Bank 0   Bank    TAG/U101    TAG/U102    TAG/U103    TAG/U104
                     1

  64KB     (4) 8K    (4)      NONE        NONE      (1) 64K x   (1) 32K x
            x 8     8K x                               1           8
                     8

  128KB     (4)     NONE      NONE        NONE      (1) 64K x   (1) 32K x
           32K x                                       1           8
             8

  256KB     (4)      (4)    (1) 16K x   (1) 16K x   (1) 64K x     NONE
           32K x    32K x      4           4           1
             8       8

  512KB     (4)     NONE      NONE        NONE      (1) 64K x   (1) 32K x
           128K x                                      1           8
             8

                        CACHE JUMPER CONFIGURATION

  Size     J15     J16     J17      J18     J19     J20     J21     J22

  64KB     1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   2 & 3   3 & 4

  128KB    2 & 3   1 & 2   1 & 2   2 & 3   1 & 2   1 & 2   1 & 2   4 & 5

  256KB    2 & 3   2 & 3   1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   1 & 2

  512KB    2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   1 & 2   4 & 5

  Note:Pins designated should be in the closed position.

    CPU SPEED CONFIGURATION

   Speed       J7        J10

   25MHz     Closed    Closed

   33MHz      Open     Closed

  50i MHz    Closed    Closed

   50MHz      Open      Open

  66i MHz     Open     Closed

                          CPU TYPE CONFIGURATION

     U1            U2            JP1           JP2              JP3

   80486SX        NONE        pins 1 & 2    pins 3 & 4       pins 2 & 3
                               closed         closed          closed

    NONE        80486SX       pins 1 & 2    pins 3 & 4       pins 2 & 3
                               closed         closed          closed

    NONE        80486DX       pins 2 & 3    pins 1 & 2     pins 1 & 2 and
                               closed         closed       3 & 4 closed

    NONE        80486DX2      pins 2 & 3    pins 1 & 2     pins 1 & 2 and
                               closed         closed       3 & 4 closed

   80486SX      80487SX       pins 1 & 2    pins 1 & 2     pins 1 & 2 and
                               closed         closed       3 & 4 closed

   80486SX      80486DX       pins 2 & 3    pins 1 & 2     pins 1 & 2 and
                               closed         closed       3 & 4 closed

   80486SX      80486DX2      pins 2 & 3    pins 1 & 2     pins 1 & 2 and
                               closed         closed       3 & 4 closed

   80486SX      ODP486SX      pins 1 & 2    pins 2 & 3     pins 1 & 2 and
                               closed         closed       3 & 4 closed

