AST RESEARCH, INC.      TECHNICAL BULLETIN #1273        8-17-95



	   RAS AND WINFAX ON 28800BPS PCMCIA MODEM


PROBLEM:

After installing WinFAX, and attempting to use Windows for Workgroups 3.11 
Remote Access Service (RAS) to access a RAS server, “Serial Overrun” errors 
may occur.


CAUSE:

WinFAX may add the line “COM2FIFO=O” to the SYSTEM.INI file, during 
installation.  This disables the buffering circuitry built-in to the 
Universal Asynchronous Receiver/Transmitter (UART) in the modem card.

SYSTEMS AFFECTED:

This symptom has been seen on the AST Ascentia 810N system, using a US 
Robotics Sportster 28.8 PCMCIA modem, but the problem can potentially 
affect any system with a 28800bps modem.


SOLUTION:

Edit the SYSTEM.INI file and change the line which reads:

	COM2FIFO=O
	    to
	COM2FIFO=1

and add the following lines immediately after:

	COM2TXFIFO=1
	COM2RXTRIGGER=8

Reboot the system.  These lines will enable UART buffering for receiving, 
allowing RAS to work properly, and disable buffering for transmitting, 
allowing WinFAX to work properly.