Functions
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In spite of the dozens of functions available on the HP-67 keyboard, you will find
the calculator functions simple to operate by using a single, all-encompassing
rule: When
you press a function key, the calculator immediately executes the function written on
the key.
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Pressing a function key causes the calculator to immediately
perform that function.
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For example, to calculate the square of 148.84 merely:
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To calculate the square root of the number now in the display:
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Notice that you did not use the function directly over the  B key to calculate
the square root. The five functions above the A, B, C, D,
and E keys are known as default functions. When you first turn the HP-67 ON,
these default functions are present in the calculator, and you can select any of them by
simply pressing the appropriate key (A through E). However, as soon as you begin
keying in a program, the default functions are lost, and the top row keys
(A through E) are used to select programs or routines within programs. The
only way to restore the default functions to the calculator is to clear the calculator
of all programs, either by turning it OFF, then ON, or by pressing fCLPRGM with
the W/PRGM-RUN switch  to W/PRGM.
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Each of the five default functions is duplicated by another key on the keyboard. For
example, you can select the square root function either with the default function
or by pressing f . When the default functions are operational, you can use a
default function by pressing only one keystroke. In this handbook, however, we normally
show the prefix function instead of the default function.
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