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From: chiu@princeton.UUCP (Kenneth Chiu)
Newsgroups: net.micro.amiga
Subject: Re: Mechanics of dropping DTR
Message-ID: <2036@princeton.UUCP>
Date: Wed, 15-Oct-86 19:23:50 EDT
Article-I.D.: princeto.2036
Posted: Wed Oct 15 19:23:50 1986
Date-Received: Wed, 15-Oct-86 23:58:14 EDT
References: <305@pttesac.UUCP> <257@hao.UUCP>
Reply-To: chiu@princeton.UUCP (Kenneth Chiu)
Organization: Princeton University Computer Science Department
Lines: 23

In article <257@hao.UUCP> hull@hao.UUCP (Howard Hull) writes:
>. . .why can't [I] blast the count to zero by repeatedly hitting the "hang up"
>menu option in the VT100 program[?]. . .

My initial thinking was that hanging up would be implemented by closing the
device for a short interval and then reopening.  Thus the count would go back
up.  However, the source says:

	case 1:
	/* add hangup code here */
	break;

So obviously blasting "hang up" doesn't work.

>. . .if a program requests exclusive use of the port, and the count is already
>up by one, then the AmigaDOS response had ought to be to return an error for
>the dev Open call.

Yes, I agree.  I couldn't find any specific information about this the manuals,
but this seemed to be the implication.
-- 
Kenneth Chiu                                              UUCP: princeton!chiu
Princeton University Computer Science Department        BITNET: 6031801@PUCC