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

DESIGN SPECS:

The DigiCHANNEL Nu/4i+ is an intelligent four port multichannel
communication board for the NuBus platform.  This board contains
four high-speed direct memory access (DMA) channels that allow
two of the ports to have full duplex DMA synchronous
capabilities.  Designed to allow you to connect multiple
terminals, printers, modems, plotters, and other RS-232
asynchronous serial peripherals.






ENGINEERING SPECS:

*    Motorola 68000 12 MHz microprocessor

*    256K of dual-ported dynamic RAM

*    Up to 128K of ROM

*    Two or four 8530 serial communication connectors

*    DB-25 connectors only

*    Four high-speed DMA channels that allow two of the serial
     ports to be synchronous

*    Four boards per system for a maximum configuration of 32
     ports



OPERATING SYSTEMS SUPPORTED:
     
     AU/X
     MacOS



PART NUMBER AND RETAIL PRICE:

     DigiCHANNEL Nu/4i+       70000406       $1195




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