}+
addition:	X = Y + X
example:	CALC> 123 345 432 + +
		 900.00
}-
subtraction:	X = Y - X
example:	CALC> 123 345 432 - -
		 210.00
}*
multiplication:	X = Y * X
example:	CALC> 123 345 432 * *
		 18,331,920.00
}/
division:	X = Y / X
example:	CALC> 123 345 432 / / DSP,4
		 154.0174
}.
"dot" command: print value of X in current display format.
}V
roll stack down
}^
roll stack up
}ABS
Absolute value of X:	X = ABS(X)
example:	CALC> 243 SIN . ABS
		... -0.89
		 0.89
}ACOS
Arc cosine of X:	X = ACOS(X)
The value returned depends on the current trig mode (DEG,RAD,GRD).
ACOS will always return a number in the range -180 to +180 degrees,
or -pi to +pi radians, or -200 to +200 grads.
example:	CALC> DEG 243 COS . ACOS
		... -0.45
		 117.00
		CALC> GRD 243 COS . ACOS
		... -0.78
		 157.00
		CALC> RAD 243 COS . ACOS
		... -0.46
		 2.04
}ASIN
Arc sine of X:		X = ASIN(X)
The value returned depends on the current trig mode (DEG,RAD,GRD).
ASIN will always return a number in the range -180 to +180 degrees,
or -pi to +pi radians, or -200 to +200 grads.
example:	CALC> DEG 243 SIN . ASIN
		... -0.89
		 -63.00
		CALC> GRD 243 SIN . ASIN
		... -0.63
		 -43.00
		CALC> RAD 243 SIN . ASIN
		... -0.89
		 -1.10
}ATAN
Arc TANGENT of X:	X = ATAN(X)
The value returned depends on the current trig mode (DEG,RAD,GRD).
ATAN will always return a number in the range -90 to +90 degrees
or -pi/2 to +pi/2 radians, or -100 to +100 grads.
example:	CALC> DEG 243 TAN . ATAN
		... 1.96
		 63.00
		CALC> GRD 243 TAN . ATAN
		... 0.80
		 43.00
		CALC> RAD 243 TAN . ATAN
		... 1.95
		 1.10
}ATAN2
inverse tangent (two arguments) X = ATAN2(Y,X)
}AUTO.
set automatic "dot" mode
}CHS
change sign of X
}CLREG
Clear any storage register.
example: CLREG,5
	 will clear register 5
}CLSTK
Clear the 4 stack registers:	X = Y = Z = T = 0
}CLSUM
clear accumulator registers:	N = SUMX = SUMY = SUMX2 = SUMY2 = SUMXY = 0
}CLX
Clear the X register:	X = 0
}COS
cosine: X = COS(X)
}COSH
hyperbolic cosine: X = SINH(X)
}CYX
combinations of Y things taken X at a time= Y!/(X!*(Y-X)!
example:	CALC> 5 3 CYX
		..  10.00
}D2R
convert degrees to radians
}DEC
set decimal display and input mode
}DEG
set degrees trigonometric mode
}DSP
set display mode digits: DSP,5 causes 5 significant decimal places
}ENG
set engineering display mode
example:	ENG,6 sets display to engineering with 5 decimal places
}ENTER
enter X into stack
}EX
exit the calculator program
}EXIT
exit calculator
}EXP
exponential: X = exp(X)
}FACT
factorial: X = X!
}FIX
set fixed point display mode
example:	FIX,3 sets display to fixed point with 3 decimal places
}FRAC
fractional part of X
}GAMMA
the GAMMA function of X (x not a negative integer)
}G2R
grads to radians
}GRD
set GRADS mode
}HELP
Print help messages about CALC commands and features.
The format of the help command is

		HELP
	or	HELP,topic

If no topic is specified then a list of available topics
is given.  Each CALC command and many special topics have
help messages available.
example:	CALC> HELP,Y^X
		... help message about the Y^X command
		 0.00
}HEX
set hexadecimal display mode
}HMS
convert hrs to hrs,min,sec
}HMS+
add hrs,min,sec
}HMS-
subtract hrs,min,sec
}HR
convert hrs,min,sec to hrs
}INT
integerize
}1/X
mulplicitive inverse of X
}L.R.
linear regression of the y and x values recorded by the SUM+ 
command.  X contains the intercept and Y contains the slope
of the least squares best fix line for the Y and X data
i.e. the best values for the equation
	Y = slope*X + intercept 
see Y^R
}LASTX
fetch previous X value
}LN
natural (base e) logarithm
}LOG
common (base 10) logarithm
}MAX
maximum	of X and Y
}MEAN
compute mean of values from SUM+
}MIN
minimum	of X and Y
}MOD
	X = Y modulo X
}NINT
The nearest integer function on X
}NOAUTO.
set no-automatic "dot" mode
}OCT
set octal display mode
}P-R
convert polar to rectangular
}%
X percent of Y
}%CH
percent change
}PI
PI (3.14159...)
}PYX
permutations of X objects out of a set of Y objects: Y!/(Y-X)!
example:	CALC> 5 4 PYX
		..  120
}R-P
convert rectangular to polar
}R2D
radians to degrees
}R2G
radians to grads
}RAD
set radians trigonometric mode
}RCL
recall from register. example: RCL,3 loads X from register 3
}RCLSUM
recall sum registers into real registers:
	reg contents
	0	N
	1	SUMX
	2       SUMY 
	3	SUMX**2
	4	SUMY**2
	5	SUMXY
}.REGS
display the contents of the registers
}RND
round number in X to displayed digits
}SCI
set scientific display mode. 
example:	SCI,2 set scientific display with 2 decimal places
}SDEV
compute standard deviation of x and y into X and Y from SUM+
}SIGN
sign of X
}SIN
sine function X = SIN(X)
}SINH
hyperbolic sine X = SINH(X)
}SQRT
square root
}.STK
show internal switches and print stack
}ST*
register multiplication by X 
example: ST*,3 multiplies register 3 by X
}ST+
register addition by X
example: ST+,4 adds X to register 4
}ST-
register subtraction by X
example: ST-,6 subtracts X from register 6
}ST/
register division by X
example: ST/,1 divides register 1 by X
}STO
store  into register
example: STO,2 stores X into register 2
}SUM+
add X  Y to accumulation
}SUM-
remove from accumulation cancels an error
}.SUM
display the contents of the SUM registers
}TAN
tangent
}TANH
hyperbolic tangent
}10^X
ten to the power X
}VIEW
display all significant digits of number no exponent
}X<>
exchange X with any register
example X<>,9 exchanges register 9 and X
}X<>Y
exchange X and Y registers
}X^2
square
}Y^R
prediction of Y from X using linear regression of the Y X data recorded
by SUM+
	X contains the predicted Y value
	Y contains the coeeficient of correlation
}Y^X
Y to the power X
}FEATURES
CALC is a programmable, Reverse Polish Notation (RPN) calculator program
for use on RT11 (version 5+) systems. CALC can be used for anything
from adding two numbers together to computing complex expressions 
The principle features of CALC are:	
	*  Reverse Polish Notation (RPN)
	*  All calculations performed in double precision
	*  4 element automatic calculation stack (X,Y,Z,T)
	*  10 data storage registers (0-9)
	*  Compatible with many HEWLETT-PACKARD calculators (11C,29,41,67)