peraino@gmu90x.gmu.edu (peraino) (03/19/90)
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?
-----------------------------------------------------------------------------
Bob Peraino UUCP : uunet!pyrdc!gmu90x!peraino
George Mason University INTERNET: peraino@gmuvax.gmu.edu
UCIS, Thompson Hall, rm 2 <- BITNET : peraino@gmuvax
4400 University Drive \ PHONE : (703)-323-2549
Fairfax, VA 22030 \- Yeah, they put us in the basement, too.
-----------------------------------------------------------------------------dan@Apple.COM (Dan Allen) (03/26/90)
In article <2620@gmu90x.gmu.edu> peraino@gmu90x.gmu.edu (peraino) writes: >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 If you turn on a shortwave radio near to the calculator, it will magnify the sound. Dan Allen