Newsgroups: comp.unix.aux Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ira.uka.de!smurf!urlichs From: urlichs@smurf.sub.org (Matthias Urlichs) Subject: Re: Scripts to deal with A/UX's buggy UUCP Message-ID: Date: Thu, 04 Apr 91 21:52:40 GMT Organization: University of Karlsruhe, FRG References: <1991Mar27.014105.5418@intacc.uucp> <1991Mar28.003019.1764@mauxci.uucp> <1991Apr2.044623.299@intacc.uucp> Lines: 35 In comp.unix.aux, article <1991Apr2.044623.299@intacc.uucp>, mann@intacc.uucp (Jeff Mann) writes: < < 1. A/UX (at least with built-in serial ports) doesn't support modem < control and hardware flow control at the same time. < 2. You MUST have modem control on an incoming line. < 3. Therefore, you CAN'T use hardware flow control. Period. < Actually, you could get by with incoming modem control only and rely on special character sequences like +++ ATH to hang up the modem. The serial ports even have two input lines. But no, the second isn't supported by A/UX. :-( Therefore you're essentially correct. < 4. Therefore, if you are using a Telebit, you can't use auto baud rate < adjusting on incoming uucp calls. You must set S50=0 and use the normal < method of sending breaks to cycle getty until the proper speed is < attained. < ??? Why? UUCP defaults to using the g protocol. That protocol defaults to requiring less than 256 unacknowledged bytes; both the modem and the A/UX buffers are quite capable of storing that many unprocessed characters, therefore there can't be any soft overruns, therefore no flow control is necessary. My T2500 here has its interface speed locked to 19200 baud and UUCP-g works perfectly with all callers (PEP,V.32,V.22bis). No problem. Now if you want to use different UUCP protocols, you need hardware flow control. Locking the speed won't really help -- what if your machine is busy swapping UUCP in and out because you're compiling some big program? -- Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de /(o\ Humboldtstrasse 7 - 7500 Karlsruhe 1 - FRG -- +49-721-621127(0700-2330) \o)/