
MICRONICS COMPUTERS, INC.

80486 ASIC EISA SYSTEM BOARD

Processor         80486DX/80486DX2
Processor Speed   33/50(internal)MHz
Chip Set          Intel
Max. Onboard DRAM 64MB
Cache             64/256KB
BIOS              Phoenix
Dimensions        355mm x 304mm
I/O Options       32-bit local bus slot, floppy drive interface,

                  parallel port, serial ports (2)
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  External keyboard            J1       Speaker                   J22
  connector

  Parallel port                J4       Power LED & keylock       J23

  Serial port 1                J5       32-bit Local bus           S1
                                        slot

  Serial port 2               J15       Reset switch               W5

  Floppy drive interface      J17       Turbo switch               W6

  External battery            J17A      Turbo LED                  W7

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Factory configured - do not           SW1/6                On
      alter

     Factory configured - do not           SW1/7               Off
      alter

     Monitor type select color             SW1/8                On

      Monitor type select                   SW1/8               Off
      monochrome

     Factory configured - do not            W11             pins 2 & 3
      alter                                                    closed

     Factory configured - do not            W12             pins 1 & 2
      alter                                                    closed

     Floppy drive interface                 W13             pins 1 & 2
      enabled                                                  closed

      Floppy drive interface                 W13             pins 2 & 3
      disabled                                                 closed

     CPU select 486DX2/50MHz                W43             pins 1 & 2
                                                               closed

      CPU select 486DX/33MHz                 W43                Open

     Factory configured - do not            W45             pins 1 & 2
      alter                                                    closed

                        PARALLEL PORT CONFIGURATION

  I/O Address        Port            W3            W4            W10

   3BC-3BEh          LPT1        pins 1 & 2     pins 2 & 3    pins 2 & 3
                                   closed        closed         closed

   378-37Ah          LPT2        pins 1 & 2     pins 1 & 2    pins 2 & 3
                                   closed        closed         closed

   278-27Ah          LPT3        pins 2 & 3     pins 1 & 2    pins 2 & 3
                                   closed        closed         closed

      N/A          Disabled      pins 2 & 3     pins 2 & 3    pins 2 & 3
                                   closed        closed         closed

                         SERIAL PORT CONFIGURATION

    Port 1          Port 2           W2            W8             W9

     COM1            COM2        pins 1 & 2     pins 1 & 2    pins 1 & 2
                                   closed        closed         closed

     COM1          Disabled      pins 1 & 2     pins 1 & 2    pins 2 & 3
                                   closed        closed         closed

   Disabled          COM2        pins 2 & 3     pins 1 & 2    pins 1 & 2
                                   closed        closed         closed

   Disabled        Disabled      pins 2 & 3     pins 1 & 2    pins 2 & 3
                                   closed        closed         closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2         Bank 3

      1MB       (4)256K x 9        NONE          NONE           NONE

      2MB       (4)256K x 9    (4)256K x 9       NONE           NONE

      3MB       (4)256K x 9    (4)256K x 9    (4)256K x 9       NONE

      4MB       (4)256K x 9    (4)256K x 9    (4)256K x 9    (4)256K x 9

      4MB        (4)1M x 9         NONE          NONE           NONE

      5MB       (4)256K x 9     (4)1M x 9        NONE           NONE

      6MB       (4)256K x 9    (4)256K x 9     (4)1M x 9        NONE

      7MB       (4)256K x 9    (4)256K x 9    (4)256K x 9     (4)1M x 9

      8MB        (4)1M x 9      (4)1M x 9        NONE           NONE

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

     10MB       (4)256K x 9    (4)256K x 9     (4)1M x 9      (4)1M x 9

     12MB        (4)1M x 9      (4)1M x 9      (4)1M x 9        NONE

     13MB       (4)256K x 9     (4)1M x 9      (4)1M x 9      (4)1M x 9

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

     16MB        (4)4M x 9         NONE          NONE           NONE

     20MB        (4)1M x 9      (4)4M x 9        NONE           NONE

     24MB        (4)1M x 9      (4)1M x 9      (4)4M x 9        NONE

     28MB        (4)1M x 9      (4)1M x 9      (4)1M x 9      (4)4M x 9

     32MB        (4)4M x 9      (4)4M x 9        NONE           NONE

     36MB        (4)1M x 9      (4)4M x 9      (4)4M x 9        NONE

     40MB        (4)1M x 9      (4)1M x 9      (4)4M x 9      (4)4M x 9

     48MB        (4)4M x 9      (4)4M x 9      (4)4M x 9        NONE

     52MB        (4)1M x 9      (4)4M x 9      (4)4M x 9      (4)4M x 9

     64MB        (4)4M x 9      (4)4M x 9      (4)4M x 9      (4)4M x 9

                         DRAM SWITCH CONFIGURATION

  Size   SW1/switch    SW1/switch   SW1/switch   SW1/switch    SW1/switch
             1             2            3            4             5

  1MB        On           On            On           On           On

  2MB       Off           On            On           On           On

  3MB        On           Off           On           On           On

  4MB       Off           Off           On           On           On

  4MB        On           On           Off           On           On

  5MB        On           On           Off          Off           On

  6MB        On           Off           On          Off           On

  7MB       Off           On            On          Off           On

  8MB       Off           On           Off           On           On

  9MB        On           Off          Off          Off           On

  10MB      Off           Off           On          Off           On

  12MB       On           Off          Off           On           On

  13MB      Off           Off          Off          Off           On

  16MB       On           On           Off           On           On

  16MB      Off           Off          Off           On           Off

                     DRAM SWITCH CONFIGURATION (CONT.)

  Size   SW1/switch    SW1/switch   SW1/switch   SW1/switch    SW1/switch
             1             2            3            4             5

  20MB       On           On           Off          Off           Off

  24MB       On           Off           On          Off           Off

  28MB      Off           On            On          Off           Off

  32MB      Off           On           Off           On           Off

  36MB       On           Off          Off          Off           Off

  40MB      Off           Off           On          Off           Off

  48MB       On           Off          Off           On           Off

  52MB      Off           Off          Off          Off           Off

  64MB      Off           Off          Off           On           Off

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

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

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

  Note:The exact location of TAG is unknown.

                        CACHE JUMPER CONFIGURATION

    Size          W20            W21             W41             W44

    64KB         Open            Open           Open          Pins 2 & 3
                                                               closed

   256KB       Pins 1 & 2     Pins 1 & 2      Pins 1 & 2      Pins 1 & 2
                closed          closed         closed          closed

