Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site ut-sally.UUCP Path: utzoo!utcs!lsuc!pesnta!amd!dual!mordor!ut-sally!crandell From: crandell@ut-sally.UUCP (Jim Crandell) Newsgroups: net.music.synth Subject: Re: Re: rs232 midi interfaces Message-ID: <1038@ut-sally.UUCP> Date: Tue, 19-Feb-85 16:52:38 EST Article-I.D.: ut-sally.1038 Posted: Tue Feb 19 16:52:38 1985 Date-Received: Wed, 20-Feb-85 04:17:12 EST References: <870@bnl.UUCP> <2560@mcnc.UUCP> <49@cvl.UUCP> Distribution: net Organization: U. Texas CS Dept., Austin, Texas Lines: 20 > > In article zadco@ssc-vax.UUCP (Rick Fairfield) writes: > > > > >MIDI requires over 30000 bits/sec. RS232 usually runs at most 19200 baud so, > > >as you can see, MIDI is a problem over RS232. I really think someone should point out that 38.4 kb/s is a standard async serial speed, and it's generally not problematic over RS-232 unless (a) you're trying to drive five-mile-long cables with it or (b) the designer of the TTL/232 converter you're using got a little carried away trying to meet the specs for a class B (FCC) device rating so that the output slew rate is too low (don't laugh -- I've seen it done). Yes, it's true that the antiquated, PMOS AY5-1013 won't handle it, but the very common 8251 certainly will, and I believe I've read that the 6850 (or was it 6851?) has been used very effectively at 76.8 kb/s. So really, now, what's so bad about ~30 k? -- Jim Crandell, C. S. Dept., The University of Texas at Austin {ihnp4,seismo,ctvax}!ut-sally!crandell