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From: higgin@cbmvax.cbm.UUCP (Paul Higginbottom)
Newsgroups: net.micro.amiga
Subject: Re: Help for weird error with serial port! (again)
Message-ID: <440@cbmvax.cbmvax.cbm.UUCP>
Date: Mon, 23-Jun-86 11:34:06 EDT
Article-I.D.: cbmvax.440
Posted: Mon Jun 23 11:34:06 1986
Date-Received: Wed, 25-Jun-86 05:06:19 EDT
References: <1887@gitpyr.UUCP>
Reply-To: higgin@cbmvax.UUCP (Paul Higginbottom)
Organization: Commodore Technology, West Chester, PA
Lines: 33

In article <1887@gitpyr.UUCP> wutka@gitpyr.UUCP (The Urbane Cowboy) writes:
>  I am having some strange problems with a terminal program I have written.
>For some reason, when it receives a NULL over the serial port, the window
>kinda dies. The program will continue to receive input through the serial
>port and print it, but I can't type anything nor close the window. Both
>of these are done with the window message stuff. I made sure that NULLs
>didn't get printed and that didn't make any difference...so the problem is
>that for some odd reason, a NULL received through the serial port is locking
>up the window. Has anyone had any trouble like this ??
>Mark Wutka
>Office of Computing Services
>Georgia Institute of Technology
>Atlanta, Ga.
>
>...!{akgua,allegra,amd,hplabs,ihnp4,masscomp,ut-ngp}!gatech!gitpyr!wutka
>...!{rlgvax,sb1,uf-cgrl,unmvax,ut-sally}!gatech!gitpyr!wutka

Dear Mark:
	It might be comforting for you to know that I have seen this behavior
exhibited in other terminal programs I have seen.  I personally believe it's
a bug in the serial.device; i.e., if it receives a NULL it kinda goes weird.
	For example, turning on a Hayes Smartmodem 1200 seems to make it
send a NULL to whatever it is connected to.  This will HANG a terminal program
I use.
	Solution: turn on modem before either connecting it to the Amiga, or
turning on the Amiga.

Sorry if this is bad news; however, it is just a theory, but I wanted you to
know that you're not alone in seeing this.

	Regards,
		Paul Higginbottom
Disclaimer: I do not work for Commodore and opinions expressed are my own.