Article View: comp.sys.amiga.tech
Article #1724Re: Sick, sick idea...
From: Colin Plumb
Date: Wed, 18 Oct 1989 21:17
Date: Wed, 18 Oct 1989 21:17
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In article <1989Oct16.143322.29737@sjsumcs.sjsu.edu> 33014-18@sjsumcs.SJSU.EDU (Eduardo Horvath) writes: >In article <17243@watdragon.waterloo.edu> ccplumb@rose.waterloo.edu (Colin Plumb) writes: >> The normal way to send a break, as far as I know, is to drop the baud rate >> really low and send a null byte (up to 15 null bits, actually). > > While I have not been working with the Amiga serial port hardware, > I have recently been working with an embedded system that has a MC68681 > ( I think I have the right part number ) which is a DUART chip. To send > a break with that, you set the break time, and give a special command. > The DUART does all the rest. I should have been clearer... the normal way to send a break *with the Amiga serial hardware* is to play tricks with the baud rate. Other chips have different techniques. The Z8530 has a control register bit that forces a space condition on the line until the bit is cleared. There are other approaches. -- -Colin
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!watdragon!rose!ccplumb From: ccplumb@rose.waterloo.edu (Colin Plumb) Newsgroups: comp.sys.amiga.tech Subject: Re: Sick, sick idea... Message-ID: <17356@watdragon.waterloo.edu> Date: 18 Oct 89 21:17:14 GMT References: <17243@watdragon.waterloo.edu> <1989Oct16.143322.29737@sjsumcs.sjsu.edu> Sender: daemon@watdragon.waterloo.edu Reply-To: ccplumb@rose.waterloo.edu (Colin Plumb) Organization: U. of Waterloo, Ontario Lines: 18