HP -01 Owner's Manual page 98

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Operational Description
96
Havingkeyedin2 x 3, press @. The equals operation computes the result X(F)Y and stores the
answerin the X-register. The contents of the F- and Y-registers remain the same.
Press
Registers
Display
X
F
Y
With the result in the X-register and both the operator and second operand left intact, your HP-01
is set up efficiently for the next operation whetherit is a chain calculation, an automatic constant,
exponentiation, or a new problem.
Earlier in this handbook, you used the exchange function in a few chain calculations. The ==
function switches the operands in the X- and Y-registers. For example, if you meant to subtract
2 from 3 but accidentally keyed in 2-3:

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