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Section 7
Program Editing
Often you may wantto alter or add to a program that is loaded in the
calculator. On your HP-67 keyboard, you will find several editing
functions that permit you to easily change any steps of a loaded
program without reloading the entire program.
As you mayrecall, except for the default function keys, all functions
and operations on the HP-67 keyboard can be recorded as instructions
in program memory except five others. These five functionsare pro-
gram editing and manipulation functions, and they can aid you in
altering and correcting your programs. (The default functions above
the top-row keys are duplicated elsewhere on the calculator by keys
that can be recorded.)
Nonrecordable Operations
a
is one keyboard operation that cannot be recorded in pro-
gram memory. When you press [
with the W/PRGM-RUN
switch wrrem [[[HMlruN set to W/PRGM, program memory is
cleared to
instructions and the calculator is reset to the top of
memory (step 000) so that the first instruction will be stored in step
001 of program memory. [
also sets the trigonometric mode
to DEG, the display mode to FIX 2, clears flags FO, F1, F2, and F3
(more aboutflags in section 13), and restores the default functions to
the keys (3 through [3 ) on the top row of the keyboard. With the
W/PRGM-RUNswitch set to RUN,
merely cancels an[{l] pre-
fix key that you have pressed.
(single step) is another nonrecordable operation. When you press
with the W/PRGM-RUN switch wprem [[[[IllRuN set to
W/PRGM, the calculator moves to and displays the next step of
program memory. When you press
down with the W/PRGM-
RUN switch wieram [l Run set to RUN, the calculator displays the
next step of program memory—when you release the
key, the
calculator executes the instruction loaded in that step.
permits
you to single step through a program, executing the program one step
at a time or merely viewing each step without execution, as you
choose.
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