
INFORMTECH INTERNATIONAL, INC.

IT486EX VER. 1

Processor         80486SX/80486DX
Processor Speed   25/33MHz
Chip Set          Intel
Max. Onboard DRAM 64MB
Cache             64/128KB (with external cache card)
BIOS              Phoenix
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Turbo switch                P1       Reset switch                P4

  Turbo LED                   P2       Power LED & keylock         P5

  Speaker                     P3       External battery            P20

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Cache write protect disabled            J5               Closed

      Cache write protect enabled             J5                Open

     On board DRAM access enabled            J8               Closed

      On board DRAM access disabled           J8                Open

     I/O recovery time select               J16               Closed
      8-bit = 11BLCK, 16-bit =
      3BLCK

      No recovery time                       J16                Open

     80486 internal cache enabled           J17               Closed

      80486 internal cache disabled          J17                Open

     Turbocache486 enabled                  J20               Closed

      Turbocache486 disabled                 J20                Open

     BIOS duplicated (to 00FF0000           J36               Closed
      hex)

      BIOS not duplicated                    J36                Open

     Turbo mode enabled                      P1                Open

      Turbo mode disabled                     P1               Closed

     Factory configured - do not           SW1/7               Off
      alter

     Monitor type select                   SW1/8               Off
      monochrome

      Monitor type select color             SW1/8                On

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

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

     34MB       (4) 4M x 9     (4) 4M x 9     (4) 256K x 9  (4) 256K x 9

     34MB       (4) 256K x 9   (4) 256K x 9   (4) 4M x 9     (4) 4M x 9

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

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

               MEMORY BANK CONFIGURATION (BANK 0 & 1)

       SIMM Type               SW1/1                  SW1/2

  No memory installed           Off                    Off

         256KB                   On                    Off

          1MB                   Off                     On

          4MB                    On                     On

               MEMORY BANK CONFIGURATION (BANK 2 & 3)

       SIMM Type               SW1/3                  SW1/4

  No memory installed           Off                    Off

         256KB                   On                    Off

          1MB                   Off                     On

          4MB                    On                     On

                MEMORY SPEED/CPU MHZ CONFIGURATION (25MHZ)

        SIMM Type                 SW1/5                    SW1/6

          256KB                    Off                      Off

           1MB                      On                       On

           4MB                      On                       On

  Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2
  & 3.

                MEMORY SPEED/CPU MHZ CONFIGURATION (33MHZ)

        SIMM Type                 SW1/5                    SW1/6

          256KB                    Off                      Off

           1MB                      On                       On

           4MB                     Off                      Off

  Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2
  & 3.

              TURBOCACHE486 CONFIGURATION

    Module         J17           J18          J19

   82485ES        Open          Open          Open

  82485MA/MB     Closed        Closed        Closed

                    TURBOCACHE486 JUMPER CONFIGURATION

    Module          J1             J2             J29            J63

   82485ES         Open           Open           Open            Open

  82485MA/MB      Closed         Closed         Closed          Closed

                   CPU SPEED CONFIGURATION

        Speed                 J3                  J15

        25MHz          pins 2 & 3 closed         Closed

        33MHz          pins 1 & 2 closed          Open

                        BATTERY TYPE CONFIGURATION

             Battery type                              J64

     4.5V (without internal current             pins 3 & 4 closed
          limiting resistor)

    3.6V-4.5V (with internal current            pins 1 & 3 closed
          limiting resistor)

      6V (without internal current              pins 2 & 4 closed
          limiting resistor)

   6V (with internal current limiting           pins 1 & 2 closed
               resistor)

    BIOS CONTROL CONFIGURATION

  ROM type      J25        J35

   28F512     Closed      Closed

   28F010     Closed       Open

   27C512      Open       Closed

   27C010      Open        Open

