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[Frank Boehm (Germany)]

The calculators were used as a cheap display. Any other calculator would have worked as well :)

[Joerg Woerner]

Frank,

You can't use a HP-21!

Read the thread below this one:

HP-21 displays all zeroes

Cheers, Joerg

[Frank Boehm (Germany)]

but a TI-1200 might have worked as well ;)