From owner-freebsd-chat@FreeBSD.ORG Mon Jul 14 21:30:04 2008 Return-Path: Delivered-To: freebsd-chat@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7E1C01065671 for ; Mon, 14 Jul 2008 21:30:04 +0000 (UTC) (envelope-from emailrob@emailrob.com) Received: from mx03.dls.net (mx03.dls.net [216.145.245.199]) by mx1.freebsd.org (Postfix) with ESMTP id 6212F8FC14 for ; Mon, 14 Jul 2008 21:30:04 +0000 (UTC) (envelope-from emailrob@emailrob.com) Received: from [216.145.235.183] (helo=emailrob.com) by mx03.dls.net with esmtp (Exim 4.63) (envelope-from ) id 1KIVEE-0007OR-Tz; Mon, 14 Jul 2008 16:05:03 -0500 Message-ID: <487BB178.90000@emailrob.com> Date: Mon, 14 Jul 2008 21:05:12 +0100 From: spellberg_robert User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.2) Gecko/20030208 Netscape/7.02 X-Accept-Language: en-us, en MIME-Version: 1.0 To: fbsd_chat References: <200807121018.39240.doconnor@gsoft.com.au> <200807131004.43681.doconnor@gsoft.com.au> <487A32BB.1040306@telenix.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: 50 baud is dead X-BeenThere: freebsd-chat@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Non technical items related to the community List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Jul 2008 21:30:04 -0000 Chuck Robey wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Warren Block wrote: > >>On Sun, 13 Jul 2008, Daniel O'Connor wrote: >> >> >>>On Sat, 12 Jul 2008, Christian Weisgerber wrote: >>> >>>>Daniel O'Connor wrote: >>>> >>>>>>It turns out that uplcom(4) adapters don't support the required >>>>>>speed of 50 baud anymore. >>>>> >>>>>You know, it might actually support it if you hack up the driver. >>>>>The source says the PL2303X "can set any rate". >>>> >>>>The data sheet disagrees. >>>> >>>>"The flexible baud rate generator of PL-2303X could be programmed to >>>> generate any rate between 75 bps and 6Mbps." >>> >>>I guess you're out of luck then :( >> >>Or just try it at 75 and see if there's enough slop to read the 50 baud >>data. > > There won't be, 50% is way too far off, I think (from experiments I did 30 years > back) that about 12% is the limit, when I had access to the best regenerators. > Regens don't even get used anymore. I forget the actual limit I probed, but I > know 1/2 over is way too far to go. > >>-Warren Block * Rapid City, South Dakota USA first, in very round numbers, you get about five per cent error in the bit_time for fifty per cent error in ten bits. usually, there are three reads, all near the center of the bit_time. so, ya gotta be kinda close. two per cent leaves plenty of room for slop. i have an inexpensive hardware solution. if any one is interested, please respond off_list, unless you think it appropriate for -chat. rob