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Section 4
Program Editing
Often you may wantto alter, correct, or add to a program that is loaded in
the calculator. On your HP-34C keyboard, you will find several editing
functions that permit you to easily add or change steps in a loaded pro-
gram without reloading the entire program.
As you may recall, there are nine functions that cannot be recorded in
program memory. Seven of these functions are program editing and
manipulation functions, and can aid you in modifying and correcting
your programs.
Nonrecordable Operations
CLEAR (prGM]is one keyboard operation that cannot be recorded in pro-
gram memory. When you press [f] CLEAR
in PRGM mode,
program memory is cleared and the calculator is reset to the top of mem-
ory (line 000). Note that (7] CLEAR [prGm]does not reset a RAD or GRD
trig mode to DEG.
(single step) is another nonrecordable operation. When you press
(n] (ss7), in PRGM mode, the calculator moves to and displays the next
line in occupied program memory. No program instructions are exe-
cuted. When you press ()
in RUN mode the calculator also moves
to and displays the next line of program memory. But when you release
the
key, the calculator executes the instruction loaded in that line.
(BsT) (back step) is a nonrecordable operation used in both PRGM and
RUN mode to move to and display the previous line of program memory.
In RUN mode the original contents of the display reappear when
is
released. No program instructions are executed.
CLEAR
is the nonrecordable operation used after a prefix key-
stroke ( (7], [@),o0r (n))tocancel thatkeystroke. CLEAR
also
cancels all keystrokes in an incomplete instruction such as (7] (Sci]or
(+). CLEAR [PREFIX] has no effect on a completed instruction (i.e.,
(1 Gens,
L, etc.).
84
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