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From: dougs@videovax.tv.tek.com (the man)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Serial port control?
Summary: Please restore com port state!
Message-ID: <6353@videovax.tv.tek.com>
Date: 10 Apr 91 23:36:38 GMT
References: <1991Apr8.044312.29004@hubcap.clemson.edu> <4790@gumby.Altos.COM> <4793@gumby.Altos.COM>
Distribution: na
Organization: Tektronix TV Measurement Systems, Beaverton OR
Lines: 7

In article <4793@gumby.Altos.COM>, jerry@gumby.Altos.COM (Jerry Gardner) writes:
> ... No com program should ever make assumptions about the
> prior state of the modem control lines when it starts up.  It should 
> always explicitly assert whatever lines it needs asserted.

To which I would add: when a com program finishes, it should restore the state 
of the port as closely as possible to what it was before the program ran.