COMTROL CORPORATION

HOSTESS 4/8, HOSTESS 550 4/8

Card Type          Serial
Chipset            16450 (Hostess 4/8) or 16550 (Hostess 550 4/8)
I/O Options        Serial ports (8)
Data Bus           16-bit ISA
Card Size          Full height, half length

[Image]

                                CONNECTIONS

         Function            Label            Function            Label

  Serial ports via 100-pin     J1      Header for 4-port            J3
  connector                            daughterboard

  Header for 4-port            J2
  daughterboard

                        USER CONFIGURABLE SETTINGS

                 Setting                     Label          Position

  »   Card does not have 4-port               JP1      Pins 2 & 3 closed
      daughterboard installed

      Card has 4-port daughterboard           JP1      Pins 1 & 2 closed
      installed

      Interrupt mask enabled                 SW2/1             On

      Interrupt mask disabled                SW2/1            Off

  »   Factory configured - do not alter      SW2/8        Unidentified

            Note:SW2/8 must be off if the daughterboard is installed.

                      COMTROL MODE ADDRESS SELECTION

  Setting    SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

      0000h   On      On      On      On      On      On      On      On

      0020h   Off     On      On      On      On      On      On      On

      0040h   On      Off     On      On      On      On      On      On

      0060h   Off     Off     On      On      On      On      On      On

      0080h   On      On      Off     On      On      On      On      On

  »   0280h   On      On      Off     On     Off      On      On      On

      1F60h   Off     Off     On      Off    Off     Off     Off     Off

      1F80h   On      On      Off     Off    Off     Off     Off     Off

      1FA0h   Off     On      Off     Off    Off     Off     Off     Off

      1FC0h   On      Off     Off     Off    Off     Off     Off     Off

      1FE0h   Off     Off     Off     Off    Off     Off     Off     Off

            Note: A total of 512 base address settings are available. The
            switches are a binary representation of the decimal memory
            addresses. SW1/8 is the Most Significant Bit and switch SW1/1
            is the Least Significant Bit. The switches have the following
            decimal values: SW1/8=4096, SW1/7=2048, SW1/6=1024, SW1/5=512,
            SW1/4=256, SW1/3=128, SW1/2=64, SW1/1=32. Turn off the
            switches and add the values of the switches that are off to
            obtain the correct memory address. (Off=1, On=0)

            SW1/1 must be off if the daughterboard is installed.

                            INTERRUPT SELECTION

  Setting     JP2    SW2/2    SW2/3    SW2/4     SW2/5    SW2/6    SW2/7

     2        Pins     On      Off      Off       Off      Off      Off
             1 & 2

     3        Pins    Off       On      Off       Off      Off      Off
             1 & 2

     4        Pins    Off      Off       On       Off      Off      Off
             1 & 2

     5        Pins    Off      Off      Off       On       Off      Off
             1 & 2

     7        Pins    Off      Off      Off       Off      Off      Off
             2 & 3

    10        Pins    Off      Off      Off       Off      On       Off
             1 & 2

    11        Pins    Off      Off      Off       Off      Off       On
             1 & 2

            Note:Pins designated are in the closed position.

            IRQ7 is only available on boards that have SW2 marked with
            INTERRUPT.