Download q650-rom-tuning-fork.hqx (68,323 KB)
Date: Thu, 18 Aug 1994 12:24:52 -0500
From: s-bytnar@ux4.cso.uiuc.edu (Steven M Bytnar)
Subject: ROM Tuning fork...
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Hi everyone,
Apple's ROM crew has done it again: I own a Centris 650. The other day, I
powered up my Mac, and decided that I should immediatley turn off my Mac so
the DAT drive could power up first. Instead of just turning the power off,
I hit the interrupt button. I heard this interesting =-D tune come from my
Mac. I'm not sure, but I think it's a hidden ROM thing that patches the
interrupt key. In the past, I've heard that Quadra 840av's exhibit a wierd
quality like this too when the power key is held down... except it drops
you into a monitor type thing instead of a tune. Here are steps to reprodue
this:
1) Hit the Power Key on the keyboard. (I dont think it matters, as long as
your Mac is _off_ initially. It would be cool if someone or I could figure
out a way to make it do this on every restart. :-)
2) Listen for the "Bzzzzzzzzt" of the power supply getting power.
3) While listening, within 2 seconds of turning it on, hit the interrupt key.
4) Enjoy the short tune it plays.
I checked; pressing some keys on the keyboard does not make the Mac act
like a MIDI keyboard based on which key was pressed. :-( For the rest of
you who might not have a chance to hear the tune, I tape recorded and then
digitized what the C650 plays. 22KHz so that you can analyze it if you
like--sorry about the background noise. In the C650 ROM also is a "Brass
Horn" beep. It sounds like a little horn that squeaks on a kid's bike. I
wont include that, probably because of pattent/copyright violations. :-)
(Hint: Use ROMmie to get your Mac's ROM resource and look for sounds using
ResEdit. I believe it's on info-mac in /dev.)
One thing I would like to pose is this: could something, even more special,
happen if the music's note-representation were typed in? =-D
Questions, comments, anything else? Email me.
Enjoy!
--Steve
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