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16 COMM Overrun




Description

This article is from the FAQ, by with numerous contributions by others.

16 COMM Overrun


This error occurs when the modem goes too fast for the COM port and
Windows. There are a couple of things you have to check. First, if
you've got an external modem running at 14.4kbps or above, make sure
you're connecting it to a COM port that uses the UART 16550a (or some
1655xx variant) chip. You can check this using the MSD.EXE program that
comes with Windows.

Now, once you've got that verified, you need to replace the old
COMM.DRV driver that came with Windows 3.x, because it was designed to
work with the older UART 8550 chip. (Windows for Workgroups 3.11
users don't need to worry about this.) The two most popular
replacement COMM drivers are CyberCom and WFXComm. Documentation is
included and they can be found at the following sites:

ftp://ftp.coast.net/simtel/win3/commprog/
ftp://ftp.winsite.com/pub/pc/win3/misc/wfxcomm.zip

Also, you need to edit your SYSTEM.INI file to include the following
statements in your [386Enh] section:

com1FIFO=1
com1buffer=1024
comboosttime=8

(If you're using a COM port other than 1, change the com1 to com2,
etc.)

Although it is quite out of date, There is a FAQ that provides a more
in-depth discussion of this subject:

http://www.inetassist.com/faqs/tcpibmpc.htm

 

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