Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!tellab5!wiseman
From: wiseman@tellabs.com (Jeff Wiseman)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Mac II ADB autostartup
Message-ID: <3630@tellab5.tellabs.com>
Date: 30 Aug 90 17:20:23 GMT
References: <2109@idunno.Princeton.EDU> <1990Aug29.103618.6714@portia.Stanford.EDU>
Sender: news@Tellabs.COM
Organization: Tellabs, Inc. Lisle IL
Lines: 37

In article <1990Aug29.103618.6714@portia.Stanford.EDU> midkiff@portia.Stanford.EDU (Neil Midkiff) writes:
>From page 291 of _Guide to the Macintosh Family Hardware_ (2nd ed.):
>
>Pin 1 of ADB connector is the bidirectional data bus (open collector,
>pulled up to +5V through 470 ohms)
>Pin 2 is the power.on line.  A key on the ADB keyboard momentarily
>grounds this pin to pin 4 to switch on the power supply on the Mac II
>family.  On other models, this pin is not connected.
>Pin 3 is +5 volts
>Pin 4 is ground.

Now this is real interesting! Since you indicated that pin 2 is not used on the
"other" macs (like my SE), it would be a real simple thing to take a low
voltage relay and hook it up in such a way that pressing the "power on" button
of my extended keyboard, I could power up my mac SE. Obviously, wiring the
relay to toggle wouldn't be a good idea since hitting the "power" button onthe
keyboard would knock down anything that you were doing without a proper
shutdown.

SOOOO!...

On a mac SE, is there a signal (or set of signals) ANYWHERE in the SE that
occur when shut down is selected from the menu that could be used as a simple
trigger to release the power up latch?

This would be, like, sooo groovey to turn my SE on and off from the keyboard!!

(Hmm... in fact, with a single relay and some wire splicing, even the ability
to only turn it ON from the keyboard is interesting...You know, then after
doing the shut down, reaching behind the mac to power it off and then flip the
switch back on to "re-arm" it.

Don't worry about me! My first box of floppies lasted longer than my mac's
warranty! :-)

--
Jeff Wiseman:	....uunet!tellab5!wiseman OR wiseman@TELLABS.COM