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Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!telxon!bobd
From: bobd@telxon.UUCP (Bob Drotleff)
Newsgroups: comp.sys.ibm.pc,comp.sys.ibm.pc.programmer
Subject: Info on DOS COM Interrupt software please
Keywords: DOS COM interrupts
Message-ID: <478@telxon.UUCP>
Date: 2 Mar 90 02:28:55 GMT
Organization: Telxon Corporation, Akron OH
Lines: 16

Hello,
	I am trying to write a DOS stand alone program to do 
serial I/O out the COM1 port. I've written several subroutines
in ASM to do polled COM1 stuff to interface to my Lattice "C"
compiler but I want to get a program (in assembler) to install
itself to handle IRQ requests to and from the COM1 port.
I can successfully get it installed in the DOS ISR table but
I have questions as to how you tell the interrupt controller
that a character is ready to transmit.
Any help or source listing's showing how this is done would be
greatly appreciated.
Please Email me any suggestions or comments.

Thanx in advance.

	R.J. Drotleff