The Museum of HP Calculators


HP-45 Features

Features in optional ROMs are listed as Option.
Features in HP mag card or tape Application Pacs are listed as +.
Other software is not included.

Display and Keyboard HP-45
Display type LED
Display format 1 Line
FIXed number format Yes
SCIentific number format Yes
ENGineering number format -
STanDard / ALL number format -
Alpha messages and prompts -
Softkeys labeled by mag. card or overlay -
Softkeys labeled by display menus -
Softkeys with neither labeling system -
Status annunciators -
Redefinable keyboard -
   
Logic HP-45
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 Yes
Named variables -
Multiple data types -
Directories -
   
Math HP-45
+, -, ×, ÷ Yes 
1/x Yes
sq. root Yes
x2 Yes
LOG x Yes
10x Yes
LN x Yes
ex Yes
yx Yes
pi Yes
% Yes
% change Yes
INTeger truncation and ABSolute value -
Trigonometric functions (SIN, COS etc.) Yes
Hyperbolic trig. (SINH, COSH etc.) -
# of trig. modes (degrees, radians, grads) 3
   
Advanced Math HP-45
Solver / root finder -
Numeric integration -
Complex numbers -
Matrix operations -
Matrix writer -
Equation writer -
Symbolic operations -
Fractions -
Plotting and graphics (display) -
Plotting and graphics (printer / plotter) -
   
Statistical HP-45
Mean, standard deviation (# of variables) 1
Summation of n, x, x2 Yes
Summation of n, x, x2, y Yes
Summation of n, x, x2, y, xy -
Summation of n, x, x2, y, y2, xy -
Summation of lists -
Random number generator -
Linear regression, estimate  -
Curve fitting -
Correlation coefficient -
Normal distribution -
Factorial Yes
Gamma -
Combinations and permutations -
   
Scientific and Time

HP-45

Polar / rectangular conversions Yes
Base conversions (2, 8, 10, 16) -
Arithmetic in bases 2, 8 and 16 -
Bit operations (AND, OR, XOR, ...) -
Selectable word size (1-64 bits) -
Selectable complement mode (1's, 2's, unsigned) -
Decimal hrs / hrs.min.sec. conversions Yes
Hrs.min.sec arithmetic -
Time of day clock -
Timer Unofficial
Dynamic calculations (timer × rate) -
Alarms -
   
Unit Conversions

HP-45

Centimeters / inches Yes
Millimeters / inches -
Meters / feet -
Kilograms / pounds (mass) Yes
Newtons / pounds (force) -
British thermal units / joules -
Liters / gallons Yes
° Celsius / ° Fahrenheit -
Other -
User-defined units -
   
Time Value of Money HP-45
Number of payments (n) -
Interest rate (i) -
Present Value (PV) -
Payment (PMT) -
Future Value (FV) -
   
Cash Flow Analysis HP-45
Net present value (NPV) -
Internal rate of return (IRR) -
   
Amortization HP-45
Accumulated Interest (ACC INT) -
Balance (BAL) -
   
Depreciation HP-45
Straight line (SL) -
Sum of the years digits (SOYD) -
Declining balance (DB) -
   
Bonds and calendar functions HP-45
Bond price -
Bond yield -
Date arithmetic / calendar functions -
   
Memory and Programming HP-45
Programming language(s) -
RAM / Max # of variables or addressable registers 9 Registers
Max # of program steps -
RAM / Max vars or regs with full optional RAM -
Max # of prog steps with full optional RAM -
Merged program steps 

-

Manual register / program memory allocation  -
Automatic register / program memory allocation

-

Overlapped register and program memory -
Continuous memory

-

Flags -
Conditional tests -
Subroutine levels -
Indexed looping (increment by +/- 1, end at 0) -
Indexed looping (choice of increment and end) -
Multiple index / loop registers -
Line number addressing -
Branching by relative line number -
Global program label addressing -
Local program label addressing -
Indirect / computed addressing and control -
Multiple indirection registers -
Pause -
Alpha messages and prompts in programs -
Alpha program listings -
Alpha string manipulation -
Program step insert / delete -
   
I/O and Expansion Features HP-45
ROM modules -
RAM modules or expansion option -
General expansion slots / connector -
Magnetic card reader/writer -
Tape drive -
Disk drive -
Upgradeable firmware -
Optical wand -
Serial port -
Infrared input -
Infrared output -
Printer -
Networking -
Other -
   
General HP-45
Sounds -
Self test -
Hard case (in addition to soft case) Yes
Additional Features -
Batteries Rechargeable
Length (inches) 5.8"
Width 3.2"
Height 1.3"
Weight (oz or lbs) 8.7 oz
Year of introduction 1973

Features in optional ROMs are listed as Option.
Features in HP mag card or tape Application Pacs are listed as +.
Other software is not included.

Unlim means limited only by available memory.

HP-45 notes:
  • Most (possibly all) HP-45's had the code for the timer found in the HP-55. See the HP-45 page for details.
  • This model supplied conversion factors rather than conversions. The 3 constants could be multiplied or divided to perform 6 conversions.

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