MULTI-TECH ANNOUNCES ISI HIGH SPEED SERIAL CARD AT SPRING COMDEX '94

MOUNDS VIEW, MN--May 23, 1994 -- Multi-Tech Systems, Inc., a leading data
communications technology company, announced its new high speed serial
card for PCs that enables accurate data transfers up to 115K bpS. The new
Intelligent Serial Interface (ISI) card, Model ISI551, eliminates the
potential problem of lost data when using today's high speed modem
technology connected to most PC' serial ports. The ISI551's 32K send and
receive buffer assures data integrity no matter what software is run (even
Windows or LAN applications), and what modem speed is used, or what serial
port technology exists in the PC hardware. The ISI551 is scheduled to ship
June 13, 1994. The ISI551 sells for $99 U.S. stand alone or can be
optionally bundled with Multi-Tech's V.34 MultiModemII at $849 U.S. for
the modem and ISI card.

"As modems continue to gain speed, most serial ports are having trouble
keeping up. This is especially true in the Windows environment or when
using LAN applications," states Raghu Sharma, President of Multi-Tech
Systems, Inc. "The answer is to add Multi-Tech's Intelligent Serial
Interface high speed serial card with buffers and an on-board processor.
The ISI551 makes your PC perform more efficiently by enabling data
transfers up to 115K bps without fear of data loss due to existing serial
port overrun. The problem is that the serial port on PCs are interrupt
driven; that is, each time data is ready, the serial port signals the PC's
processor with an interrupt telling the PC to receive the data. If the PC
is busy processing data elsewhere, the serial port data may be lost. The
ISI551's buffer and hardware/software flow control prevent such data loss.
Combine that with Multi-Tech's ten year limited warranty and factory
technical support, and you probably have a high speed serial port solution
to bring to your next PC platform."

The Model ISI551 Intelligent Serial Interface (ISI551) is a half-size
expansion card that operates in any 286, 386, or 486 eight or sixteen bit
ISA or EISA compatible bus PC providing a high speed RS232C/D serial
interface capability with high performance features. The ISI551 can be
used with any high-speed Multi-Tech or other brand modem, and can be
accessed by any software written to the 16550A UART specification. The
ISI551 supports Coml, Com2, Com3, Com4, and any custom L/O address or
custom IRQ. It supports hardware and software Flow Control and has a 32K
buffer for transmitting and receiving.

Multi-Tech Systems, which reported sales of $95 million for 1993, was
founded in 1970 to manufacture data communications equipment and systems
for the global market of networking product users. The Minnesota-based
company is well known for its MultiModem line of dial-up communications
products. Multi-Tech's family of products includes a complete line of
data/fax modems, MultiMux voice/data/fax statistical multiplexers, DSUs,
3270/3780/5250 emulation systems, X.25 PADs, UNIX serial interfaces,
communications software, LAN/WAN connectivity products, and most recently,
the MultiModemPCS, a voice/data/fax personal communication system. These
products are sold in over 70 countries through a worldwide network of
distributors, manufacturer's reps, system integrators, value-added
resellers (VARs) and retailers.

Multi-Tech Systems, Inc. can be contacted at its headquarters: 2205 Woodale
Drive, Mounds View, Minnesota 55112. Voice (612) 785-3500 or (800)
328-9717, FAX (612) 7859874, International FAX (612) 331-3180.

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