COMTROL CORPORATION

HOSTESS 550 16

Card Type          Multi-user serial controller
Chipset/Controller Texas Instruments (UART)
I/O Options        Serial ports (16)
Maximum DRAM       N/A

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                                CONNECTIONS

       Purpose           Location           Purpose           Location

  100 Pin interface         CN1        Daisy chain               J2
  connector                            connector 2

  Daisy chain               J1
  connector 1

  Note: Daisy chain connectors are for the use of multiple cards on the
  same interrupt.

                 RS-232/RS-422 MODE SELECTION

        Port                RS-232               RS-422

     JP1-16/A-C        Pins 2 & 3 closed   Pins 1 & 2 closed

                      SERIAL PORT INTERRUPT SELECTION

  IRQ   SW2/1    SW2/2   SW2/3   SW2/4    SW2/5   SW2/6    SW2/7   SW2/8

  2/9    N/A      On      Off     Off     Off      Off     Off      Off

  3      N/A     Off      On      Off     Off      Off     Off      Off

  4      N/A     Off      Off     On      Off      Off     Off      Off

  5      N/A     Off      Off     Off      On      Off     Off      Off

  10     N/A     Off      Off     Off     Off      On      Off      Off

  11     N/A     Off      Off     Off     Off      Off      On      Off

  12     N/A     Off      Off     Off     Off      Off     Off       On

  Note: These interrupts are for AT&T, DOS, INTERACTIVE 386/ix, SCO
  XENIX, and SCO UNIX operating systems.

  MASK INTERRUPT CONFIGURATION

    Setting           SW2/1

    Enabled            On

    Disabled           Off

                           I/O ADDRESS SELECTION

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

   200h      On      On     Off      On      On      On      On      On

   280h     Off      On     Off      On      On      On      On      On

   500h      On     Off      On     Off      On      On      On      On

   580h     Off     Off      On     Off      On      On      On      On

   600h      On      On     Off     Off      On      On      On      On

   680h     Off      On     Off     Off      On      On      On      On

   700h      On     Off     Off     Off      On      On      On      On

  Note: These settings are used for SCO XENIX, SCO UNIX, AT&T UNIX, AND
  INTERACTIVE 386/ix operating systems.

                       MISCELLANEOUS TECHNICAL NOTE

   Serial ports are located on an interface box which connects to Hostess
                 550 via the 100-pin interface connector.