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General Operations
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In this section we will describe how to:
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perform the clear operations
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control the display
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enter numbers in scientific notation
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recover from wrong keystrokes using the Last X feature.
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In addition, a reference block is devoted to the operation of the Stack Lift (automatic enter).
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Clear Operations
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Four separate clearing operations are possible with the HP-65, using the  f functions of the fourth row of keys.
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Clearing Unwanted Prefix
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fPREFIX cancels the effect of a prefix so that a non-prefix operation can be done. Let’s say you accidentally press
f, f-1, or g, before keying in a number. If you then press the number key, you will get an alternate
function of that key instead of the desired number-entry operation. To prevent this from happening, press fPREFIX
to cancel the effect of the unwanted prefix key, then key in a number. If a wrong prefix key is pressed when
another prefix is wanted, the error can be corrected by simply pressing the correct prefix and proceeding from
there.
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The above procedure can also be used to clear the following keys (not yet explained):
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STO RCL DSP GTO LBL
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Clearing Stack Registers
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fSTK clears all four registers (X,
Y,
Z, and
T) of the operational stack. To clear only the
X-register, press CLx.
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Clearing Addressable Registers
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fREG clears all nine addressable registers. (These will be described in a later section.)
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