Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucsd!sdcc6!sdcc19!sdcc15!ww10bag
From: ww10bag@sdcc15.ucsd.edu (David Etherton)
Newsgroups: comp.sys.ibm.pc
Subject: Communications Hardware and Interrupt Processing
Keywords: interrupts, communications
Message-ID: <1220@sdcc15.ucsd.edu>
Date: 27 Feb 89 02:47:53 GMT
Reply-To: ww10bag@sdcc15.UUCP (David Etherton)
Organization: University of California, San Diego
Lines: 18

I am interested in writing a TSR communications program for the IBM
PC.  I can handle the DOS re-entrancy problem, along with all the
other messy things in TSR's, but unfortunately, I know absolutely
nothing about the hardware, and the BIOS routines just will not
serve my needs.  Could anyone recommend where I can find
information concerning:

	- I/O port assignments (AND USAGE) for all COM port-related
	  items.
	- Initialization procedures, along with any special tricks
	  about interrupt processing for the UART chip.
	- The formats of communications protocals like X-modem and
	  Z-modem.

I really don't know where to start, (maybe PC Tech journal?) and a
nudge in the right direction would help, too.  Please send e-mail.

David Etherton  |  detherton@ucsd.edu  |  detherto@ucsd.BITNET