Date: Tue, 24 Dec 1996 09:36:09 -0500
Message-Id: <199612241436.JAA09011@delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: kagel AT dg1 DOT bloomberg DOT com
CC: libolt AT primenet DOT com, djgpp AT delorie DOT com
In-reply-to: <9612241402.AA24727@quasar.bloomberg.com >
	(kagel AT quasar DOT bloomberg DOT com)
Subject: Re: modem Questions


> 	modem = fopen( "COM1", "rw" );  /* Assuming your modem is at COM1: */

There is no "rw" mode.  Try "r+" instead.  Also, you should disable
buffering, and you must do an fseek() or fflush() when switching from
read to write or write to read.