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RCL 00
x
÷
So what about if you have to solve more 100 of this kind of equation? Only changing the a, b and c
values? It would be better to save all the steps in the calculator's memory and let it do the
calculations for you. This is what calculators programming is about.
To enter in the program mode you must do ▀ PRGM (above R/S key).
If the memory has no program you are going to see:
00►{ 0-Byte PRGM}
01 .END.
(If there is a program we can erase it by doing ▀ CLEAR CLP before entering in program mode)
Now just enter the first sequence starting in RCL 01
x
2
, etc.
Every command will take a line and in the end you will have
08 -
09►STO 03
This means that this part of the program takes 9 lines. You can move through the program lines by
using the ▲▼ cursors (which, of course, cannot be programmed). Two important things to say here
are: 1-The functions are not always shown in the calculators display as we know them. For example
the
x
2
function is showed as X↑2. 2-We don't need to press ENTER after a number, unless
between two numbers.
Now let's enter the second part of the program which gives to us the first root. (if you used the
cursors you must go back where you stopped). After doing so we have
17 x
18►÷
Again in the display the functions are not exactly as we know and
x
appears as SQRT.
Unless we store the result in a memory we must find a way to stop the program to see the result.
This is doing by the function STOP which is entered by pressing R/S. (R/S means “run and stop”)
So after this we have
18 ÷
19►STOP
Finally we enter the last part of the program and after this we have
27 x
28►÷
If you move using the cursors you will find .END. in line 29 (which is the end of the program) and
in line zero we find 00►{ 31-Byte PRGM }. Almost 1 byte per line of program.
As we said the HP-42S has about 7200 bytes of memory. Not bad! Just for comparison HP-32S had
390 bytes and spend about 1.5bytes per line, HP-20S had only 99 lines/steps and HP-9G has 400
steps while HP-33S has 31KB (but hardly can take advantage of this due to 26 memories/labels
limitation, which is the same of 32S, and it spends about 3bytes per line).
After entered the program just press EXIT. Now enter the numbers a, b and c of the equation. For
example for the equation
x
2
−5 x4=0
we enter
- (Version 0.6) 1
- 1 Introduction 3
- 2 Basic Operations 4
- 3 Memory 12
- 00, R01, etc 13
- 4 Probability 15
- 5 Complex Numbers 17
- 6 Programming 18
- 7 Using the Solver 23
- 8 Numeric Integration 25
- 9 Statistics 26
- 10 Matrices 28
- 1 B1+...+AN BN. You 30
- 12 Flags 32
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