The DigiCHANNEL COM/4i would be appropriate for your application.

DESIGN SPECS:  

The DigiCHANNEL COM/4i is an intelligent four port multichannel
communications board designed to add multiple serial ports for
DOS applications requiring on-board data processing and
buffering.


ENGINEERING SPECS:

*    ISA bus

*    10 MHz 80188 microprocessor

*    RS-232 asynchronous communication

*    256K RAM (32K is dual-ported)


OPERATING SYSTEMS SUPPORTED:

     Citrix                   SCO XENIX 286
     Concurrent Controls      SCO XENIX 386
     Microport 286            SCO UNIX System V/386
     Microport 386            UNIX SYS V/386 Rel 3.2
     MS-DOS                        AT&T UNIX 
     OS/2                          EVEREX ESIX
     PC-MOS                        EURIX 
     QNX                           Intel UNIX
     SUN O/S                       Interactive 386/ix
     THEOS
     TSX-32


CABLING OPTIONS:

     Cable               Part Number         Retail Price
     DB25 I/O Cable      76000008            $50
     DB25 I/O Box        76000030            $80
     RJ45 Connector      76000038            $80


PART NUMBER AND RETAIL PRICE OF BOARD:

     DigiCHANNEL COM/4i  77000008            $835



DISTRIBUTORS:  For the name of the DigiBoard distributor near
               you, please call (800) 344-4273 or (612) 943-9020.