
MICRONICS COMPUTERS, INC.

EISA 3 VL-BUS SYSTEM BOARD

Processor       80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set        Micronics
Max. Onboard    64MB
DRAM
Cache           64/128/256/512KB
BIOS            Phoenix
Dimensions      355mm x 304mm
I/O Options     32-bit VESA local bus slots (2), floppy drive interface,
                IDE interface,

                parallel port, serial ports (2)
NPU Options     None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Hard drive LED             CN1       Parallel port              J30

  External battery            J3       Floppy drive               J31
                                       interface

  Turbo switch                J4       IDE interface              J32

  Turbo LED                   J5       Serial port 1              J33

  Power LED & keylock         J8       Serial port 2              J34

  Speaker                    J10       32-bit VESA Local bus       S1
                                       slot

  Reset switch               J11       32-bit VESA Local bus       S2
                                       slot

  External keyboard          J13
  connector

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

      Factory configured - do not            W1            pins 1 & 2
       alter                                                  closed

      Monitor type select color              W7              Closed

       Monitor type select monochrome         W7               Open

      AT style keyboard                      W16              Open

       PS/2 style keyboard                    W16             Closed

      CMOS memory normal operation           W17           pins 1 & 2
                                                              closed

       CMOS memory clear                      W17           pins 2 & 3
                                                              closed

      Real Time Clock memory normal          W18              Open
       operation

       Real Time Clock memory clear           W18             Closed

  Note: W18 may not appear on the system mainboard, depending upon the
  clock chip installed. If W18 is present, use it instead of W17. The
  location of W18 is unknown.

                            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/U42     TAG/U43    TAG/U44     TAG/U45
                       1

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

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

  256KB    (4) 32K     (4)     (1) 16K    (1) 16K     (1) 64K     NONE
             x 8      32K x      x1         x1         x 8
                       8

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

                        CACHE JUMPER CONFIGURATION

  Size     W8      W9     W10      W11     W12     W13      W14     W15

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

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

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

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

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

        U1                U2             W2          W5           W6

       None          80486SX (PQFP)    pins 1 &    pins 1 &      None
                                          2           2

      80486SX            None          pins 1 &    pins 2 &   pins 2 & 3
                                          2           3

      80487SX        80486SX (PQFP)    pins 1 &    pins 2 &   pins 1 & 2,
                                          2           3          3 & 4

      80487SX            None          pins 1 &    pins 2 &   pins 1 & 2,
                                          2           3          3 & 4

      80486DX        80486SX (PQFP)    pins 2 &    pins 1 &   pins 1 & 2,
                                          3           2          3 & 4

      80486DX            None          pins 2 &    pins 1 &   pins 1 & 2,
                                          3           2          3 & 4

     80486DX2        80486SX (PQFP)    pins 1 &    pins 2 &   pins 1 & 2,
                                          2           3          3 & 4

     80486DX2            None          pins 1 &    pins 1 &   pins 1 & 2,
                                          2           2          3 & 4

      Pentium            None          pins 2 &    pins 2 &   pins 1 & 2,
     Overdrive                            3           3          3 & 4

  Note:Pins designated should be in the closed position.

                CPU SPEED CONFIGURATION

        CPU              Speed               W3

  80486SX/80486DX        25MHz               On

  80486SX/80486DX        33MHz               Off

     80486DX2           50i MHz              On

     80486DX2           66i MHz              Off

