Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!agate!violet.berkeley.edu!izumi
From: izumi@violet.berkeley.edu (Izumi Ohzawa)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Accessing the comm port with MS C
Message-ID: <19956@agate.BERKELEY.EDU>
Date: 5 Feb 89 03:53:16 GMT
References: <411@lakart.UUCP>
Sender: usenet@agate.BERKELEY.EDU
Organization: University of California, Berkeley
Lines: 30

In article <411@lakart.UUCP> dg@lakart.UUCP (David Goodenough) writes:
>I've just been landed with a project to write some software that communicates
>with the modem and printer ports on a PC. I'm going to be using MS C V5.1,
>but I have no real idea how to go about writing / reading / testing the
>state of the ports. I need the following:
>
>1. Check if the modem port has a character to read
>2. Get that character
>3. Write a character to the modem port
>4. Write a character to the printer port
>
>Also, if there is any code that needs to be executed to initiate the modem
>port to run at 9600 (or possibly 19200) BPS, and 8N1, I'd want to know
>about that too.
>

All of the above are supported by COMx port drivers which conform to
FOSSIL driver specification.
These drivers replace and extend BIOS INT14h.

You should be able to get a copy of the driver from most BBS systems
particularly those running OPUS BBS software.  These BBS software 
itself heavily depend on the driver.  And binaries are in public 
domain.

Also, I saw a FOSSIL driver in WSMR-SIMTEL20 archive.

Izumi Ohzawa
izumi@violet.berkeley.edu
...ucbvax!violet!izumi