HP 33S - Clearing One or more Programs; The Checksum

Simple Programming
12–21
File name 33s-E-Manual-1008-Publication(1st).doc Page : 386
Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm
The catalog shows you how many bytes of memory each labeled program
segment uses. The programs are identified by program label:
 

where 67 is the number of bytes used by the program.
Clearing One or More Programs
To clear a specific program from memory
1. Press
¹ u
{

} and display (using
Ø
and
×
) the label of the
program.
2. Press
¹ ¡
.
3. Press
Å
to cancel the catalog or
~
to back out.
To clear all programs from memory:
1. Press
¹ £
to display program lines (PRGM annunciator on).
2. Press
¹ ¡
{

} to clear program memory.
3. The message
   
prompts you for confirmation. Press {

}.
4. Press
¹ £
to cancel program entry.
Clearing all of memory (
¹ ¡
{

}) also clears all programs.
The Checksum
The
checksum is a unique hexadecimal value given to each program label and its
associated lines (until the next label). This number is useful for comparison with a
known checksum for an existing program that you have keyed into program
memory. If the known checksum and the one shown by your calculator are the
same, then you have correctly entered all the lines of the program. To see your
checksum:
1. Press
¹ u
{

} for the catalog of program labels.
2. Display the appropriate label by using the cursor keys, if necessary.
3. Press and hold
º Î
to display

checksum and

length.
For example, to see the checksum for the current program (the "cylinder"
program):