Path: utzoo!utgpu!water!watmath!clyde!rutgers!mit-eddie!uw-beaver!cornell!batcomputer!pyramid!voder!apple!korn
From: korn@apple.UUCP (Peter "Arrgh" Korn)
Newsgroups: comp.sys.mac
Subject: Re: Computer Technology Changes the Music World (from AppleLink)
Message-ID: <7220@apple.UUCP>
Date: 20 Jan 88 00:48:37 GMT
References: <1988Jan14.104540.18190@LU.Se> <1988Jan14.105121.18267@LU.Se> <2762@cbdkc1.ATT.COM>
Reply-To: korn@apple.UUCP (Peter "Arrgh" Korn)
Distribution: comp.sys.mac
Organization: Apple Computer Inc., Cupertino, USA
Lines: 22
Disclaimer:  I wasn't hired to give Apple's official opinions on anything

Re:  Apple's MIDI interface not requiring external power

In article <2762@cbdkc1.ATT.COM> czei@cbdkc1.UUCP 
(Michael S. Czeiszperger CB 1L334 x4952 ADMIN) writes:
>In article <1988Jan14.105121.18267@LU.Se> roland@DNA.LU.Se 
>(Roland Mansson) writes:
>>An external power supply isn't required, eliminating extra wires and 
>>the need for another power source.
>
>Then how is it powered?  The 512 *does* have power supplied in the
>serial ports, but the Plus, SE, and II *do not*.

The 128K, 512K and 512Ke macintoshes all had +5V on pin 2 (out of 9 on the
DB-9 connector).  This is no longer there on the Mac Plus, Mac SE, Mac II,
and all Apple machines that use the new circular 8-pin connector (I believe
these are called 'sub-min 8' connectors, or some such).  However, these new
connectors do indeed have power supplied on them; +12V is on pin 1 (which
is the pin on the lower left of the circle when looking at it face on).

Peter
-- 
 Peter "Arrgh" Korn    korn@apple.com   !hplabs!amdahl!apple!korn    "Hi mom!"