Section 8
Program Editing
Often you wish to alter a program that you have keyed into the calculator. The HP-41C has several editing functions that permit you to easily change any lines in any of your programs without reloading the entire program.
Editing Functions
Here are the HP-41C editing functions and what they do:
CLP (clear program) Clears the named program from program memory. If the program or an ALPHA label inside the program has been assigned to a key for USER mode execution, those assignments are also nullified.
   (corrections) In PRGM (program) mode, deletes keystrokes while you are entering data of ALPHAs, or deletes entire lines that are already stored in program memory.
SST (single step) In PRGM mode, SST steps forward one line in program memory. In normal or USER mode, SST excutes the current line and steps forward one line in program memory. Also, while you are using CATALOG , SST steps forward one entry.
BST (back step) In PRGM mode, normal and USER modes, BST steps back one line in program memory; no instructions are executed. Also, while you are using CATALOG , BST steps back one entry.
GTO · (go to line number of ALPHA label) when you specify a three-digit line number, sets calculator to that line. When you specify an ALPHA label, sets the calculator to that label. Pressing GTO · · sets the calculator to the end of program memory and tells you the number of unused registes that remain in program memory. This also places an END at the end of the previous program in program memory if one is not already present. In PRGM mode, normal and USER modes, BST steps back one line in program memory; no instructions are executed. Also, while you are using CATALOG , BST steps back one entry.
SIZE (size of data storage register allocation) When you specify a three-digit number indicating an allocation of registers to data storage registers, program memory is automatically adjusted and all remaining registers are allocated to program memory. Any time the HP-41C repeatedly displays TRY AGAIN , you must change the number of storage registers (which automaically changes the size of program memory) before you continue. Refer to section 7.
DEL (delete program memory lines) When you specify a three-digit number,the HP-41C deletes that number of lines beginning at the current position in memory. The DEL function only deletes instructions within a program and up to (but not including) an END
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