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Actually is not just PI you type but NOPQ P FGHI I but we wrote that for simplicity.
Now to get this number back it is just type RCL “PI”. When you type RCL the “PI” should appear
to you select it.
You can also use STO+, STO-, STOx and STO÷ even in this case since the types of the things you
are operating are the same.
We can deal with the four lines of the stack as we deal with the memory positions. In this case the
lines of the stack are called ST X, ST Y, ST Z and ST T respectively. To access this we press '.'
before the name of the line. For example:
5 STO . ST X puts 5 in line x of the stack while 5 STO . ST X STO . ST Y is a very extravagant
way to enter 5 twice.
As the content of the stack can change easily I don't think “STO .” is a good thing. But I cannot say
the same of “RCL .” which may be very useful to get the content especially of lines z and t. You can
also use STO and RCL with +, -, x and ÷ and '.' to work with the content of the lines of the stack.
For example:
5 STO ÷ . ST Z divides line z by 5.
3.1 The ▀ CATALOG menu.
The ▀ CATALOG menu has the following submenus:
FCN, PGM, REAL, CPX, MAT, MEM
FCN: It shows all the functions available in HP-42S calculator. It has many lines and one must use
the ▼ and ▲ to navigate through the lines. Here you are going to find important functions we don't
see in the keyboard including hyperbolic functions (SINH, COSH, etc), functions to work with
integer and real numbers like IP (integer part) and FP (fraction part), programming functions, etc.
Don't forget you can also use XEQ “function name”.
PGM: It shows all variables with programs in the memory.
REAL: It shows all variables with real numbers in the memory. (But does not show numbers in R00 ,
etc)
CPX: It shows all variables with complex numbers.
MAT: It shows all variables with matrices. The REGS matrix always appears. It contains the
numeric memories R00, R01, etc.
MEM: It shows all available memory.
3.2 More on the ▀ CLEAR menu
We already saw some of the CLEAR menu functions, but there are also:
CLV: Clears variables we had stored using STO “name”.
CLRG: Clears the R00, R01, etc, memories known as registers.
In the second line
CLLCD: Clears the LCD display (may be useful when plotting)
CLALL: Clears all the memory of the calculator.