Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA
Path: utzoo!utcs!lsuc!pesnta!hplabs!hao!seismo!brl-tgr!ron
From: ron@brl-tgr.ARPA (Ron Natalie <ron>)
Newsgroups: net.music.synth
Subject: Re: MIDI
Message-ID: <8617@brl-tgr.ARPA>
Date: Mon, 25-Feb-85 14:17:34 EST
Article-I.D.: brl-tgr.8617
Posted: Mon Feb 25 14:17:34 1985
Date-Received: Wed, 27-Feb-85 10:28:22 EST
References: <3416@alice.UUCP>
Organization: Ballistic Research Lab
Lines: 9

> Also, as Dave Hsu pointed out,
> the MIDI standard requires a current loop interface, hence an opto-
> isolator.
> 

Eh?  The schematics for the MPU show the lines to be balanced pairs.
They are driven by convetional drivers, no optoisolaters are involved.

-Ron