Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!uakari.primate.wisc.edu!uflorida!haven!uvaarpa!mcnc!ecsvax.uncecs.edu!dukeac!wolves!ggw From: ggw@wolves.uucp (Gregory G. Woodbury) Newsgroups: comp.sys.ibm.pc Subject: Generate a BREAK on COMn: ? Summary: hardware or bios break Keywords: MSDOS COM1 COM2 BREAK RS-232 Message-ID: <1990Mar10.014345.5932@wolves.uucp> Date: 10 Mar 90 01:43:45 GMT Reply-To: ggw@wolves.UUCP (Gregory G. Woodbury) Followup-To: comp.sys.ibm.pc Organization: Wolves Den UNIX BBS Lines: 17 I find myself in a situation where I have to write a quick and dirty program to generate a break on a DOS COMn: port. The break (in this case) is that peculiar state of the RS-232 line that hold the transmit signal in mark state for a particular length of time. I am dealing with a rather vanilla multi-port COM card and a modern (Phoenix or AMI) BIOS. Is there a bios function to do this? The machines are ISA bus '286 and '386 machines running DOS 3.3. Any particulars or hints appreciated. -- Gregory G. Woodbury Sysop/owner Wolves Den UNIX BBS, Durham NC UUCP: ...dukcds!wolves!ggw ...dukeac!wolves!ggw [use the maps!] Domain: ggw@cds.duke.edu ggw@ac.duke.edu ggw%wolves@ac.duke.edu Phone: +1 919 493 1998 (Home) +1 919 684 6126 (Work) [The line eater is a boojum snark! ]