    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.