
INFORMTECH INTERNATIONAL, INC.

IT286SB

Processor         80286
Processor Speed   5/6/8/10MHz
Chip Set          C & T
Max. Onboard DRAM 1MB
SRAM Cache        None
BIOS              Unknown
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Speaker                     J13      External battery            J18

  Power LED & keylock         J16      Turbo LED                   J20

  Reset switch                J17

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Power good signal detect from            J23           pins 1 & 2
      power supply                                            closed

      Power good signal detect from            J23           pins 2 & 3
      board                                                   closed

     CPU speed software selectable            SW1           pins 2 & 3
                                                              closed

      CPU speed select 5.33/6.7MHz             SW1           pins 1 & 2
                                                              closed

      CPU speed select 8/10MHz                 SW1             open

     Monitor type select monochrome           SW2           pins 2 & 3
                                                              closed

      Monitor type select color                SW2           pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

       Size           Bank 0       Bank 1       Jumper W4     Jumper W5

         256KB      (18) 4164     (18) 4164     pins 1 & 2    pins 1 & 2
                                                 closed         closed

         512KB      (18) 41256      NONE        pins 2 & 3    pins 1 & 2
                                                 closed         closed

        640KB      (18) 41256    (18) 4164     pins 1 & 2    pins 2 & 3
                                                 closed         closed

        1024KB      (18) 41256    (18) 41256    pins 2 & 3    pins 2 & 3
                                                 closed         closed

                       NPU CLOCK RATE CONFIGUARATION

        NPU             Clock Rate         Jumper W7         Jumper W8

      80287-6           3.6/5.33MHz          closed          pins 1 & 2
                                                              closed

      80287-6             4.46MHz            closed          pins 1 & 2
                                                              closed

      80287-8            5.33/8MHz            open           pins 2 & 3
                                                              closed

      80287-8          4.46/6.67MHz          closed          pins 1 & 2
                                                              closed

     80287-10           6.67/10MHz            open           pins 2 & 3
                                                              closed

                          BIOS TYPE CONFIGURATION

        BIOS               Size           Jumper W2         Jumper W3

         27128          32K EPROM        pins 2 & 3        pins 1 & 2
                                            closed            closed

          27256          64K EPROM        pins 1 & 2        pins 1 & 2
                                            closed            closed

          23128        32K MASK ROM       pins 2 & 3        pins 2 & 3
                                            closed            closed

          23256        64K MASK ROM       pins 1 & 2        pins 2 & 3
                                            closed            closed

                        BATTERY TYPE CONFIGUARATION

           Battery                     J21                    J22

      Internal lithium (2 x    pins 1 & 2 closed            open
              3VDC)

         External lithium              open                 closed
              (6VDC)

         External alkaline             open                  open
              (6VDC)

