Path: utzoo!attcan!uunet!pyrdc!gmu90x!peraino
From: peraino@gmu90x.gmu.edu (peraino)
Newsgroups: comp.sys.handhelds
Subject: Listen to your HP48's heartbeat.
Keywords: HP48
Message-ID: <2620@gmu90x.gmu.edu>
Date: 19 Mar 90 15:04:36 GMT
Organization: George Mason Univ., Fairfax Va.
Lines: 19




No, I haven't lost it; you can listen to your HP48's heartbeat.
Go to a quiet room. Turn your unit on, and place the clock on the
status line. Place your ear to the calculator (or the calculator to your
ear) around the center of the keyboard, and you will hear a high pitch
rushing sound, with a pulse every one second, which coincides with the
clock seconds. My guess is the "pulse" is the activity caused by the
interrupt to update the display. Is this caused by a miniscule transformer?


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       Bob Peraino                   UUCP    : uunet!pyrdc!gmu90x!peraino
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