The Museum of HP Calculators


HP-22S 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-22S
Display type LCD
Display format 1 Line
FIXed number format Yes
SCIentific number format Yes
ENGineering number format Yes
STanDard / ALL number format Yes
Alpha messages and prompts Yes
Softkeys labeled by mag. card or overlay -
Softkeys labeled by display menus Yes
Softkeys with neither labeling system -
Status annunciators Yes
Redefinable keyboard -
   
Logic HP-22S
Logic system Algebraic
Stack levels -
Last x Yes*
Undo -
Precedence Yes
Parentheses Yes
Storage Addition (STO +) Yes
Storage Arithmetic (STO +, -, ×, ÷) Yes
Storage Exponentiation (STO ^) -
Recall Arithmetic -
Named variables Yes
Multiple data types -
Directories -
   
Math HP-22S
+, -, ×, ÷ 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 Yes
Trigonometric functions (SIN, COS etc.) Yes
Hyperbolic trig. (SINH, COSH etc.) Yes
# of trig. modes (degrees, radians, grads) 3
   
Advanced Math HP-22S
Solver / root finder Yes
Numeric integration -
Complex numbers -
Matrix operations -
Matrix writer -
Equation writer -
Symbolic operations -
Fractions -
Plotting and graphics (display) -
Plotting and graphics (printer / plotter) -
   
Statistical HP-22S
Mean, standard deviation (# of variables) 2
Summation of n, x, x2 Yes
Summation of n, x, x2, y Yes
Summation of n, x, x2, y, xy Yes
Summation of n, x, x2, y, y2, xy Yes
Summation of lists -
Random number generator -
Linear regression, estimate  Yes
Curve fitting -
Correlation coefficient Yes
Normal distribution -
Factorial Yes
Gamma -
Combinations and permutations Yes
   
Scientific and Time

HP-22S

Polar / rectangular conversions Yes
Base conversions (2, 8, 10, 16) Yes
Arithmetic in bases 2, 8 and 16 Yes
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 -
Dynamic calculations (timer × rate) -
Alarms -
   
Unit Conversions

HP-22S

Centimeters / inches Yes
Millimeters / inches -
Meters / feet -
Kilograms / pounds (mass) Yes
Newtons / pounds (force) -
British thermal units / joules -
Liters / gallons Yes
° Celsius / ° Fahrenheit Yes
Other -
User-defined units -
   
Time Value of Money HP-22S
Number of payments (n) Eqn Lib*
Interest rate (i) Eqn Lib*
Present Value (PV) Eqn Lib*
Payment (PMT) Eqn Lib*
Future Value (FV) Eqn Lib*
   
Cash Flow Analysis HP-22S
Net present value (NPV) -
Internal rate of return (IRR) -
   
Amortization HP-22S
Accumulated Interest (ACC INT) -
Balance (BAL) -
   
Depreciation HP-22S
Straight line (SL) -
Sum of the years digits (SOYD) -
Declining balance (DB) -
   
Bonds and calendar functions HP-22S
Bond price -
Bond yield -
Date arithmetic / calendar functions -
   
Memory and Programming HP-22S
Programming language(s) -
RAM / Max # of variables or addressable registers 26 variables /
371 bytes
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

Yes

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-22S
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-22S
Sounds -
Self test Yes
Hard case (in addition to soft case) -
Additional Features Eqn Lib*
Batteries 3 SR 44
Length (inches) 5.85"
Width 3.15"
Height 0.6"
Weight (oz or lbs) 5 oz
Year of introduction 1988

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-22S notes:
  • Built-in equation library included Time Value of Money, roots of a quadratic equation, ideal gas law, kinetic energy etc.
  • LAST key brought back previous result even though there was no stack.
  • To start the self test, with the calculator on, press and hold the yx key and press the ON/C key. Pressing any key will step through a series of tests (including printing a copyright) until you see KBD 01. Then you must press each key from the upper left from left to right and then down until you see 22S OK If there is a problem, you will see a FAIL message. To exit the test, at any point, press and hold the LN key and then press the ON/C key. A continuous test (minus the keyboard test) can be started by holding 1/x and pressing ON/C. Exit this test in the same way as the individual test.

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