COMTROL CORPORATION

HOSTESS 550

Card Type          Multi-user serial controller
Chipset/Controller Texas Instruments (UART)
I/O Options        Serial ports (4 or 8)
Maximum DRAM       N/A

[Image]

                                CONNECTIONS

       Purpose           Location           Purpose           Location

  100-pin interface         CN1        Upgrade connector         J2
  connector                            1

  Daisy chain               CN2        Upgrade connector         J3
  connector 1                          2

  Daisy chain               CN3
  connector 2

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

                           I/O ADDRESS SELECTION

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

   140h       Off      On       Off      On       On       On        On

   200h       On       On       On       Off      On       On        On

   240h       Off      On       On       Off      On       On        On

   280h       On       Off      On       Off      On       On        On

   500h       On       On       Off      On       Off      On        On

   540h       Off      On       Off      On       Off      On        On

   580h       On       Off      Off      On       Off      On        On

   640h       Off      On       On       Off      Off      On        On

   680h       On       Off      On       Off      Off      On        On

   6C0h       Off      Off      On       Off      Off      On        On

   700h       On       On       Off      Off      Off      On        On

       Note: These settings are for use with SCO XENIX, SCO UNIX, AT&T
       UNIX, INTERACTIVE 386/ix, and Microport V/386 operating systems.

                            I/O ADDRESS SELECTION

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

   280h       First      On      Off     On      Off     On      On      On

   240h      Second      Off     On      On      Off     On      On      On

            Note:These settings are for use with the SunOS operating system
            with a maximum of two Hostess 550 controllers in a system..

                      SERIAL PORT INTERRUPT SELECTION

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

   2       On        On       Off      Off       Off      Off       Off

   3       On       Off       On       Off       Off      Off       Off

   4       On       Off       Off       On       Off      Off       Off

   5       On       Off       Off      Off       On       Off       Off

   10      On       Off       Off      Off       Off       On       Off

   11      On       Off       Off      Off       Off      Off       On

       Note: These settings are for use with SCO XENIX, SCO UNIX, AT&T
       UNIX, INTERACTIVE 386/ix, DOS, and Microport V/386 operating
       systems.

                            I/O ADDRESS SELECTION

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

   280h       First      On      Off     On      Off    Off     Off     Off

   240h      Second      On      Off     Off     On     Off     Off     Off

  Note: These settings are for use with the SunOS operating system.

                       MISCELLANEOUS TECHNICAL NOTE

    Switch 1/1 is Off for an eight port controller, on for a four port.
   Switch 2/8 is on for a four port controller and Off for an eight port.
   Serial ports are located on an interface box which connects to Hostess
                 186 via the 100-pin interface connector.