Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!henry From: henry@utzoo.UUCP (Henry Spencer) Newsgroups: net.unix Subject: Re: 8 bit I/O vs 4BSD Message-ID: <4704@utzoo.UUCP> Date: Fri, 30-Nov-84 12:42:11 EST Article-I.D.: utzoo.4704 Posted: Fri Nov 30 12:42:11 1984 Date-Received: Fri, 30-Nov-84 12:42:11 EST References: <254@bragvax.UUCP> <522@watcgl.UUCP>, <1389@umcp-cs.UUCP> Organization: U of Toronto Zoology Lines: 15 > Speaking of flow control, has anyone ever thought about how much > problems using in-band data for this has caused? If terminals had > hardware flow control, we might not have kludges like ... It's hard to make hardware flow control work over phone modems that only support in-band data. Or over any long-propagation-delay network, unless you use positive control ("ok, send me N more bytes") rather than negative control ("stop! my buffers are full!"). Note that many of the ASCII control characters, including DC1 and DC3 (XON and XOFF), are explicitly reserved for this sort of control function. That is, they technically are *not* "in-band data", and people who use them as such do so at their own risk. -- Henry Spencer @ U of Toronto Zoology {allegra,ihnp4,linus,decvax}!utzoo!henry