altering clock speed

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1 total messages Started by k... Ken Yap Wed, 28 Feb 1990 17:16

#1654

Author: k... Ken Yap
Date: Wed, 28 Feb 1990 17:16

12 lines
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This is marginally computer related but...

When the first cheap LSI based calculators came out, I opened one up
to look at the circuit. Invariably the clock is provided by an on-chip
oscillator with external R and C. I decided to increase the
capacitance drastically to see what would happen. Since the clock
controls everything including keyboard scanning, output display and
internal operation, it was quite amusing to watch the calculator take
half a second to react to a keypress, take several seconds to do a
multiplication, and finally shift the result into the display, digit
by digit. I almost felt that if I slowed the clock rate more and
opened up the chip I would see the electrons in flight. :-)

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