Input to the stack
The operands are stored as floating-point numbers in the floating-point stack of the calculator. The most recent elements are entered in the x register, which lies at the bottom of the stack. New elements are entered there, pushing up the entire stack. If the stack overflows to 10 numbers, the oldest element is lost.
digits 0,1,2...9	used to enter mantissa and exponent figures
<	used to delete the last character entered
.	The decimal point (.) used in the mantissa
E and E-	used to start writing the exponent (E for positive exponents, E- for negative exponents)
+/-	changes the sign of the floating-point number in x
Enter	stops the editing of x register and pushes the stack up, so that the x register is free to receive a new floating-point number
drop	removes the content of the x register, and pulls the stack down
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Basic arithmetic operators
There are five basic arithmetic operators in this calculator :
+	add the content of register x and register y, store the result in register x and remove y
-	substract the content of register x from register y, store the result in register x and remove y
*	multiply the content of register x and register y, store the result in register x and remove y
/	divide the content of register y by the content of register x, store the result in register x and remove y
y**x	elevate register y to the power in x, store the result in register x and remove y

Stack management commands
Stack management commands allows some reordering of the floating-point numbers in the arithmetic stack:
dup	duplicate (enter a copy of) register x
drop	delete register x
swap	interchange register x and register y
over	duplicate (enter a copy of) register y
up	roll up the content of the stack by bringing the oldest element in register x
down	roll down the content of the stack by bringing register x to the top of the stack
Clear Stack	remove the whole content of the floating-point stack
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Functions applying to x register
A few keys activates functions applied to the content of the x register:
^2	replace x by x2
sqr	replace x by the square root of x
1/x	replace x by its multiplicative inverse 1/x
x!	replace x by its factorial x!. If x is not an integer, the gamma function gamma(x-1) is computed
abs	replace x by its positive absolute value
exp	replace x by ex
ln	replace x by its Napier logarithm log(x)
rnd	round x to the nearest integer value
int	remove from x the digits after the decimal point, to leave its integer part
frac	remove from x the digits before the decimal point, to leave the fractional part

Trigonometric functions
The following functions compute basic trigonometric functions:
mode	switch from radians to degrees and back when using circular trigonometric functions
sin	replace x by sin(x)
asin	replace x by inverse sine function asin(x)
cos	replace x by cos(x)
acos	replace x by inverse cosine function acos(x)
tan	replace x by tan(x)
atan	replace x by inverse tangent function atan(x)
sinh	replace x by the hyperbolic sine sh(x)
asinh	replace x by the inverse hyperbolic sine function ash(x)
cosh	replace x by the hyperbolic cosine ch(x)
acosh	replace x by the inverse hyperbolic cosine function ach(x)
tanh	replace x by the hyperbolic tangent th(x)
atanh	replace x by the inverse hyperbolic tangent function ath(x)
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Physics predefined constants
The following keys are used to introduce physics constants, all expressed in the SI system :
h	Planck Constant (ratio of the photon energy to its frequency)	6.62660755 x 10-34 J.s
hbar	Planck Constant/(2*pi)	1.05457267 x 10-34 J.s
c	speed of light in vacuum	299792458 ms-1
N	Avogadro number	6.02213674 x 1023
k	Boltzmann constant	1.3806581 x 10-23J.K-1
R	Perfect gas constant	8.314511869 J.K-1
1/(4*pi*eps0)	Constant in Coulomb law	8.987551760 x 109 Nm2C-2
G	Gravitational constant	6.6725985 x 10-11 Nm2kg-2
eps0	vacuum permittivity	8.85418782 x 10-12 Fm-1
mu0	vacuum permeability	4 x pi x 10-7 Hm-1
e	absolute value of electron charge	1.60217733 x 10-19 C
m	electron mass	9.10938975 x 10-31 kg
muB	Bohr magneton	9.27401543 x 10-24 JT-1
a0	Bohr radius	5.29177249 x 10-11 m
Rd	Rydberg (13.6 eV)	2.17987411 x 10-18 J
Hr	Hartree (27.2 eV)	4.35974822 x 10-18 J
alpha	fine-structure constant	0.00729735308
Compton	Compton wavelength of electron	2.42631058 x 10-12 m
amu	atomic mass unit	1.66054021 x 10-27 kg
mp	proton rest mass	1.672614 x 10-27 kg
mn	neutron rest mass	1.67492 x 10-27 kg
Stefan	Stefan constant	5.66914 x 10-08 Jm-2s-1K-4
c1	first radiation constant (8*pi*hc)	5.66914 x 10-08 Jm-2s-1K-4
c2	Second radiation constant	0.01438833 m.K
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Conversion functions
A few important unit conversions are possible with this calculators:
mode	switch from radians to degrees and back when using circular trigonometric functions
A/m	A length, in register x, expressed in units of m (meters) is converted into angstr&oulm;ms
m/A	A length, in register x, expressed in units of angstr&oulm;ms is converted into meters
eV/J	An energy, in register x, expressed in units of J (joules) is converted into electron-volts
J/eV	An energy, in register x, given in units of electron-volts is converted into SI joules
cal/J	An energy, in register x, expressed in units of J (joules) is converted into calories
J/cal	An energy, in register x, given in units of calories is converted into SI joules
deg	Specifies that the number just entered is expressed in degree, and make the appropriate conversion according to the mode selected (deg or rad)
min	Specifies that the number just entered is expressed in minutes, and make the appropriate conversion according to the mode selected (deg or rad)
sec	Specifies that the number just entered is expressed in seconds, and make the appropriate conversion according to the mode selected (deg or rad)
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