The Museum of HP Calculators


HP-27S 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-27S
Display type LCD
Display format 2 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-27S
Logic system Algebraic
Stack levels 4*
Last x Yes*
Undo -
Precedence Yes
Parentheses Yes
Storage Addition (STO +) Yes
Storage Arithmetic (STO +, -, ×, ÷) Yes
Storage Exponentiation (STO ^) Yes
Recall Arithmetic -
Named variables -
Multiple data types -
Directories -
   
Math HP-27S
+, -, ×, ÷ 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) 2
   
Advanced Math HP-27S
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-27S
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 -Yes
Random number generator Yes
Linear regression, estimate  Yes
Curve fitting Yes
Correlation coefficient Yes
Normal distribution -
Factorial Yes
Gamma -
Combinations and permutations Yes
   
Scientific and Time

HP-27S

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 Yes
Timer -
Dynamic calculations (timer × rate) -
Alarms Yes
   
Unit Conversions

HP-27S

Centimeters / inches -
Millimeters / inches -
Meters / feet -
Kilograms / pounds (mass) -
Newtons / pounds (force) -
British thermal units / joules -
Liters / gallons -
° Celsius / ° Fahrenheit -
Other -
User-defined units -
   
Time Value of Money HP-27S
Number of payments (n) Yes
Interest rate (i) Yes
Present Value (PV) Yes
Payment (PMT) Yes
Future Value (FV) Yes
   
Cash Flow Analysis HP-27S
Net present value (NPV) -
Internal rate of return (IRR) -
   
Amortization HP-27S
Accumulated Interest (ACC INT) Yes
Balance (BAL) Yes
   
Depreciation HP-27S
Straight line (SL) -
Sum of the years digits (SOYD) -
Declining balance (DB) -
   
Bonds and calendar functions HP-27S
Bond price -
Bond yield -
Date arithmetic / calendar functions Yes
   
Memory and Programming HP-27S
Programming language(s) -
RAM / Max # of variables or addressable registers 6.7K bytes /
10 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

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-27S
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 Yes
Printer Option
Networking -
Other -
   
General HP-27S
Sounds Yes
Self test -
Hard case (in addition to soft case) -
Additional Features -
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-27S notes:
  • Algebraic logic with a "history stack". LAST retrieved value above on stack.
  • To start the self test, with the calculator on, press and hold the fourth menu key (LN) and press the ON/CLR key. Pressing any key will step through a series of tests (including printing a copyright) until you see KBD. Then you must press each key from the upper left from left to right and then down until you see KBD OK. After another key, you'll see OK-27S-E. If there is a problem, you will see a FAIL message. To exit the test, at any point, press and hold the third menu key (ex) key and then press the ON/CLR key. A continuous test (minus the keyboard test) can be started by holding the firth menu key (yx)and pressing ON/C. Exit this test in the same way as the individual test.

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