The Museum of HP Calculators

HP Forum Archive 07

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HP-80 lockup trick
Message #1 Posted by David Smith on 4 Feb 2002, 3:56 p.m.

While punching around on an HP80 the other day, I found a way to lock it up with a blank display.

Turn it on. Press DATE. Press DATE. Press X-bar. Nighty night.

Later machines that display 9.99999999E99 after the first DATE will not lock up.


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