
INFORMTECH INTERNATIONAL, INC.

IT486SL-50MHz Ver. 2.0

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33/50MHz
Chip Set          OPTI
Max. Onboard DRAM 40MB
SRAM Cache        64/256KB
BIOS              OPTI
Dimensions        218mm x 330mm
I/O Options       Auxiliary keyboard connector
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  External battery             J11      Turbo LED                 JP11

  Power LED & keylock          J20      Reset switch               SW1

  Speaker                      J21      Turbo switch               SW2

  Auxiliary keyboard           J22

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select monochrome           JP2             open

      Monitor type select color                JP2            closed

     Factory configured - do not alter        JP6             open

     External battery type select            JP14           pins 1 & 3
      lithium 3.6VDC                                          closed

      External battery type select            JP14           pins 1 & 2
      alkaline 4.5VDC                                         closed

      External battery type select four       JP14           pins 3 & 4
      pack AA 6VDC                                            closed

     Factory configured - do not alter       JP15             open

      I/O bus select zero wait states         JP16            closed

                                              JP17            closed

      I/O bus select one wait state           JP16            closed

                                              JP17             open

      I/O bus select two wait states          JP16             open

                                              JP17            closed

      I/O bus select three wait states        JP16             open

                                              JP17             open

     Factory configured - do not alter       JP18             open

                            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

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

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

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

     12MB       (4) 1M x 9      (4) 1M x 9     (1) 4M x 36       NONE

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

     16MB       (4) 1M x 9      (4) 1M x 9     (1) 4M x 36   (1) 4M x 36

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

     24MB       (4) 1M x 9      (4) 4M x 9     (1) 4M x 36       NONE

     28MB       (4) 1M x 9      (4) 4M x 9     (1) 4M x 36   (1) 4M x 36

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

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

     40MB       (4) 4M x 9      (4) 4M x 9     (1) 4M x 36   (1) 4M x 36

                          CPU TYPE CONFIGURATION

     CPU Type             JP3               JP4                JP5

      80486DX          pins 2 & 3          closed           pins 1 & 2
                         closed                              closed

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

      80486SX             open              open            pins 2 & 3
                                                             closed

       SRAM JUMPER CONFIGURATION

   Size      JP9      JP10      JP12

   64KB      open     open      open

  256KB     closed   closed    closed

                            SRAM CONFIGURATION

       Size              Bank 0              TAG         Dirty Bit (U64)

       64KB            (8) 8K x 8        (2) 16K x 4       (1) 64K x 1

       256KB          (8) 32K x 8        (2) 16K x 4       (1) 64K x 1

                   CPU SPEED CONFIGURATION

      CPU Speed              JP7                  JP13

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

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

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

