Features in optional ROMs are listed as Option. 

Display and Keyboard  HP41CX 
Display type  LCD 
Display format  1 Line 
FIXed number format  Yes 
SCIentific number format  Yes 
ENGineering number format  Yes 
STanDard / ALL number format   
Alpha messages and prompts  Yes 
Softkeys labeled by mag. card or overlay  Yes 
Softkeys labeled by display menus   
Softkeys with neither labeling system   
Status annunciators  Yes 
Redefinable keyboard  Yes 
Logic  HP41CX 
Logic system  RPN 
Stack levels  4 
Last x  Yes 
Undo   
Precedence   
Parentheses   
Storage Addition (STO +)  Yes 
Storage Arithmetic (STO +, , ×, ÷)  Yes 
Storage Exponentiation (STO ^)   
Recall Arithmetic   
Named variables   
Multiple data types   
Directories   
Math  HP41CX 
+, , ×, ÷  Yes 
1/x  Yes 
sq. root  Yes 
x^{2}  Yes 
LOG x  Yes 
10^{x}  Yes 
LN x  Yes 
e^{x}  Yes 
y^{x}  Yes 
pi  Yes 
%  Yes 
% change  Yes 
INTeger truncation and ABSolute value  Yes 
Trigonometric functions (SIN, COS etc.)  Yes 
Hyperbolic trig. (SINH, COSH etc.)  Option 
# of trig. modes (degrees, radians, grads)  3 
Advanced Math  HP41CX 
Solver / root finder  Option 
Numeric integration  Option 
Complex numbers  Option 
Matrix operations  Option 
Matrix writer   
Equation writer   
Symbolic operations   
Fractions   
Plotting and graphics (display)   
Plotting and graphics (printer / plotter)  Option 
Statistical  HP41CX 
Mean, standard deviation (# of variables)  2 
Summation of n, x, x^{2}  Yes 
Summation of n, x, x^{2}, y  Yes 
Summation of n, x, x^{2}, y, xy  Yes 
Summation of n, x, x^{2}, y, y^{2}, xy  Yes 
Summation of lists   
Random number generator   
Linear regression, estimate  Option 
Curve fitting  Option 
Correlation coefficient  Option 
Normal distribution  Option 
Factorial  Yes 
Gamma  + 
Combinations and permutations   
Scientific and Time  
Polar / rectangular conversions  Yes 
Base conversions (2, 8, 10, 16)  Octal+Option 
Arithmetic in bases 2, 8 and 16   
Bit operations (AND, OR, XOR, ...)  Option 
Selectable word size (164 bits)   
Selectable complement mode (1's, 2's, unsigned)   
Decimal hrs / hrs.min.sec. conversions  Yes 
Hrs.min.sec arithmetic  Yes 
Time of day clock  Yes 
Timer  Yes 
Dynamic calculations (timer × rate)   
Alarms  Yes 
Unit Conversions  
Centimeters / inches  Option (some) 
Millimeters / inches   
Meters / feet   
Kilograms / pounds (mass)   
Newtons / pounds (force)   
British thermal units / joules   
Liters / gallons   
° Celsius / ° Fahrenheit   
Other   
Userdefined units   
Time Value of Money  HP41CX 
Number of payments (n)  Option 
Interest rate (i)  Option 
Present Value (PV)  Option 
Payment (PMT)  Option 
Future Value (FV)  Option 
Cash Flow Analysis  HP41CX 
Net present value (NPV)  Option 
Internal rate of return (IRR)  Option 
Amortization  HP41CX 
Accumulated Interest (ACC INT)  Option 
Balance (BAL)  Option 
Depreciation  HP41CX 
Straight line (SL)  Option 
Sum of the years digits (SOYD)  Option 
Declining balance (DB)  Option 
Bonds and calendar functions  HP41CX 
Bond price  Option 
Bond yield  Option 
Date arithmetic / calendar functions  Yes 
Memory and Programming  HP41CX 
Programming language(s)  RPN 
RAM / Max # of variables or addressable registers  319 
Max # of program steps  10002231* 
RAM / Max vars or regs with full optional RAM   
Max # of prog steps with full optional RAM   
Merged program steps  Yes 
Manual register / program memory allocation  Yes 
Automatic register / program memory allocation   
Overlapped register and program memory   
Continuous memory  Yes 
Flags  56 
Conditional tests  10 
Subroutine levels  6 
Indexed looping (increment by +/ 1, end at 0)  Yes 
Indexed looping (choice of increment and end)  Yes 
Multiple index / loop registers  Yes 
Line number addressing   
Branching by relative line number   
Global program label addressing  Yes 
Local program label addressing  Yes 
Indirect / computed addressing and control  Yes 
Multiple indirection registers  Yes 
Pause  Yes 
Alpha messages and prompts in programs  Yes 
Alpha program listings  Yes 
Alpha string manipulation  Yes 
Program step insert / delete  Yes 
I/O and Expansion Features  HP41CX 
ROM modules  Yes 
RAM modules or expansion option  Yes 
General expansion slots / connector  Yes 
Magnetic card reader/writer  Option 
Tape drive  Option 
Disk drive  Option 
Upgradeable firmware   
Optical wand  Option 
Serial port  Option 
Infrared input   
Infrared output  Option 
Printer  Option 
Networking  HPIL option 
Other  Various 
General  HP41CX 
Sounds  Yes 
Self test   
Hard case (in addition to soft case)   
Additional Features  Ext. Funcs.* 
Batteries  4 N cells 
Length (inches)  5.6" 
Width  3.1" 
Height  1.2" 
Weight (oz or lbs)  7 oz 
Year of introduction  1983 
Features in optional ROMs are listed as Option. 
HP41CX notes:

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