Keyboard
Overview
All Simulator functions are accessible from the keyboard. You can access the primary functions, like the digits or the square root function, with a single keyboard key. Other functions, especially the secondary functions, require a sequence of two or more consecutive keys.
In addition to key sequences, shortcuts are available for some common and often used functions. Shortcuts
should be more intuitive and easier to remember in some cases. For example, to run a program with label A
you can key in the sequence F3 Q
or you can use the shortcut Alt–A.
The following table gives an overview on how key sequences and shortcuts are organised:
Key/Sequence/ Shortcut 
Description 

key  Primary functions of the HP15C keys. There are also a few secondary functions, e.g. % and π, which are mapped to a single key. 
F key  Gold secondary functions. 
G key  Blue secondary functions. 
Alt–key  Popup menus and shortcuts for secondary functions. 
F1…F12  Function keys and program related commands. 
Ctrl–key  Interaction with the operating system. 
Mac OS X specifics
The keyboard on macOS is handled differently: Ctrl becomes command or ⌘
 Alt becomes control – option or ⌃–⌥. For some keys also ⌘– option works, but most combinations are used by macOS itself.
User mode specifics
In User mode, the main and golden function of the keys A through E are exchanged. Other keys are not affected. The mapping of the computer keyboard keys to the HP15C keys does not change. Clicking e^{x} with the mouse or pressing E on the keyboard in User mode will run the program with labelB
. To call the exponential function in User mode, click
B or f e^{x} or press F E.
HP15C Keypad
This section shows keyboard keys and shortcuts according to their position on the HP15C keypad:
A  B  C  D  E  MATRIX  FIX  SCI  ENG  SOLVE 
AltA  AltB  AltC  AltD  AltE  AltZ  
√x̅  e^{x}  10^{x}  y^{x}  ⅟x  CHS  7  8  9  ÷ 
Q  E  X  Y  \,Alt/  Alt±, Z  7  8  9  ÷, / 
x²  LN  LOG  %  Δ%  ABS  DEG  RAD  GRD  x≤y 
AltX  AltN  AltG  %  D    
LBL  HYP  DIM  (i)  I  RESULT  x↔  DSE  ISG  ∫xy 
F8  H  I  J, ShiftI  Alt<, >  
SST  GTO  SIN  COS  TAN  EEX  4  5  6  × 
Right  F2, O  S  C  T  ShiftE  4  5  6  * ,× 
BST  HYP^{1}  SIN^{1}  COS^{1}  TAN^{1}  π  SF  CF  F?  x=0 
Left  AltH  P  
PSE  Σ  PRGM  REG  PREFIX  RAN #  →R  →H.MS  →RAD  Re↔Im 
F6  Space  #  Tab  
R/S  GSB  R↓  x↔y  ←  1  2  3  −  
F5, V  F3, B  Down  <, >  Backsp.  E  1  2  3  − 
P/R  RTN  R↑  RND  CLx  N  →P  →H  →DEG  TEST 
F9  F4  Up  ESC  T  
FRAC  USER  E  x!  ŷ,r  L.R.  Py,x  
U  R  !  
ON  f  g  STO  RCL  0  .  Σ+  +  
AltO  F  G  M  R  Return  0  . ,  Ins  + 
INT  MEM  LSTx  x̅  s  Σ−  Cy,x  
L  Del 
Keys by Context
This section summarises keyboard keys, shortcuts and key sequences by context:
 Online Help and Configuration
 Calculating
 Complex Math
 Data Storage Registers
 Edit and Format
 Menus
 System Integration
 Program (Run mode)
 Program (PRGM mode)
Mouse buttons are referred to as B1 = left button, B2 = middle button or mouse wheel and B3 = right button.
Online Help and Configuration
Keyboard  HP15C key  Function 

F1    Display the Simulator online help. 
Ctrl–F1 Shift–F1 
  Display the help file for the current program (if available). 
Ctrl–,    Opens the Preferences dialogue box. 
Calculating
Keyboard  HP15C key  Function 

#  f RAN #  Generate a random number. 
!  f x!  Factorial of the number in the X register. 
space  f PREFIX  Displays all ten significant digits of the number in the
X register. The display changes as long as you hold the space key pressed. When you release the key, the display switches back to the current display format. 
%  g %  Computes the percentage X of the value in the Y register. 
< , >  x↔y  Exchanges the contents of the X and Y register. 
C  COS  Computes the cosine of the number in the X register. 
E  e^{x}  Computes the exponential function of the number in the X register. 
Shift–E  EEX  Enter EXponent. Allows you to enter the exponent of the number in the X register. 
H  f HYP  Prefix for hyperbolic functions. Must be followed by S, C or T or click SIN, COS or TAN respectively. 
Alt–H  g HYP^{1}  Prefix for inverse hyperbolic functions. Must be followed by S, C or T or click SIN, COS or TAN respectively. 
I  f (i)  Indirect addressing. See also Complex Math below. 
Shift–I  f I  Access to index register as part of a keysequence, e.g. f x↔ I. See also Complex Math below for other usages of Shift–I. 
L  g LSTx  Rolls up the stack one register and writes the contents of the LSTx register to the X register 
P  g π  Returns the value of π. 
Q  √x̅  Computes the square root of the number in the X register. 
S  SIN  Computes the sine of the number in the X register. 
T  TAN  Computes the tangent of the number in the X register. 
X  10^{x}  Computes 10 to the power of the number in the X register. 
Y  y^{x}  Computes Y to the power of X. 
Alt–< Alt–> 
f x↔  Must be followed by a valid data storage register. Exchanges the contents of that register and the X register. 
Alt–X  g x²  Computes the square of a number. 
Alt–− Alt–+ 
CHS  Changes the prefix of the number in the X register. 
\ , Alt–/  ⅟x  Computes the inverse of the number in the X register. 
 (Pipe)  g ABS  Computes the absolute value of the number in the X register. 
Ins Alt–Enter 
Σ+  Accumulates the numbers in the X and Y register to the statistic sums in the data storage registers R_{2} through R_{7}. 
Del  g Σ−  Removes the numbers in the X and Y register from the statistic sums in the data storage registers R_{2} through R_{7}. 
Complex Math
Keyboard  HP15C key  Function 

G 4 8  g SF 8  Switches the HP15C into Complex mode. 
G 5 8  g CF 8  Switches Complex mode off. 
I  f (i)  Displays the imaginary part of the complex number in the X
register. The imaginary part is displayed as long as you hold the key pressed. When you release the key the real part of the number is displayed again. 
J , Shift–I  f I  Upper case i. Takes the Y and X register from the real stack and creates a complex number Y+iX 
Tab  f Re↔Im  Exchanges the real and the imaginary part of the complex number in the X register. If Complex mode is not active, it is switched on. 
F 1  f →R  The X register must contain a complex number in polar coordinates. This function then computes the rectangular coordinates. 
G 1  g →P  The X register must contain a complex number in rectangular coordinates. This function then computes the polar coordinates. 
Data Storage Registers
Keyboard  HP15C key  Function 

M  STO  STOre. Must be followed by a valid data storage register. Copies the contents of the X register to the given register. 
R  RCL  ReCaLl. Must be followed by a valid data storage register. Copies the contents of that register to the X register. 
Alt–M  B3–STO  Invokes the store popup menu. Selecting a register from the menu copies the contents of the X registers to the selected register 
Alt–R  B3–RCL  Invokes the recall popup menu. Selecting a register from the menu copies the registers contents to the X register. 
Edit and Format
Keyboard  HP15C key  Function 

U  f USER  Toggles User mode on/off. 
⟵  ←  Run mode: Deletes the last digit typed in or clears the X register
if the input is completed. PRGM mode: Deletes the current program line. 
Esc  g CLx  Clears the X register and sets it to zero. 
Shift–Esc    Clear all. Sets all registers to zero. This is the combination of f REG
and setting the stack registers and the LSTx register to zero. Disabled in PRGM mode. 
↑ Wheel fwd 
g R↑  Roll up the stack one register. 
↓ Wheel bwd 
R↓  Roll down the stack one register. 
Alt–. Alt–, 
ON .  Toggles the representation of the decimal point and the digit separator. 
Menus
Keyboard  HP15C key  Function 

Alt–F  B3–F?  Flag menu. 
Alt–M  B3–STO  Data storage registers menu in storage mode. Selecting a data storage register from the menu copies the contents of the X to that data storage register. 
Alt–O , F10  B3–ON  ON menu. 
Alt–R  B3–RCL  Data storage registers menu in recall mode. Selecting a data storage register from the menu copies the contents of that register to the X register. 
Alt–S  B3–display  In Run mode, this will pop up the stack menu and the program menu in PRGM mode. 
Alt–T  B3–TEST  Test menu with ten compare functions. Not available in Run mode. 
Alt–Z  B3–MATRIX  Matrix functions menu. 
System Integration
Keyboard  HP15C key  Function 

Ctrl–C  B1–display doubleclick 
Copies the contents of the X register to the operating systems clipboard. 
Shift–Ctrl–C  Copies the contents of the X register in the current display format. For example, if the format is set to f ENG 4, the result of 7 g LOG is displayed as 845,10 03. Shift–Ctrl–C will copy this as 845,10e03 , whereas Ctrl–C will copy it as 0,8450980400142568


Ctrl–E    Export program to HTML. 
Ctrl–V B2 
  Copies the operating systems clipboard contents to the X register. If the contents can not be converted into a valid floatingpoint number, nothing is copied. 
Ctrl–M    Saves the current Simulator memory to the memory file. 
Ctrl–L    Reloads the previously saved Simulator memory from the memory file. 
Ctrl–O    Open a program file. 
Ctrl–R    Reset the memory of the Simulator. 
Ctrl–S    Save program to a file. The default file type is '.15C' 
Ctrl–T    HP15C stays on top of other applications on the desktop even if it hasn't the focus. 
Ctrl–Q    Exit HP15C. 
Ctrl–+    Select the next available font set from the list (cycle forward). The shortcut is disabled, while the Preferences dialogue is open. 
Ctrl–    Select the previous available font set from the list (cycle backward). The shortcut is disabled, while the Preferences dialogue is open. 
Program (Run mode)
Keyboard  HP15C key  Function 

Ctrl–F1 Shift–F1 
  Display the help file for the current program (if available). 
F2 , O  GTO  GoTO. Must be followed by a valid program label. Positions the program pointer on the label but does not run the program. 
F3 , B  GSB  GoSuB. Must be followed by a valid program label. Runs the program with the given
label. To run a program with label A you must key in F3 Q
and not F3 A.
This is because A is a secondary function to key
√x̅, which is mapped to Q. 
F4  g RTN  ReTurN. The program pointer is moved to step 000. 
F5 , V  R/S  Run/Stop. Either runs or stops a program. 
F9  g P/R  Program/Run mode. Switches to PRGM mode. Mac OS X: ⌘–F9 
F11    Toggles program mnemonics in menus on/off. Mac OS X: ⌘–F11 
Alt–F11    Toggles coloured program menus on/off. 
F12 , Ctrl–D    Opens the Program Description dialogue box. Used to edit/enter program documentation 
←  g BST  Backward STep. The program pointer is moved back one step. 
→  SST  Single STep. The program pointer is moved forward one step. This allows
it to execute a program step by step. While the key is pressed, the display shows the next step but does not executed it. The step is executed only when the key is released. 
Alt–A…E  f A…E  Runs the program that starts at the given label. 
Alt–0…9  GSB 0…9  Runs the program that starts at the given label. There are no shortcuts for labels higher than 9. 
  B3–GTO  Pops up the program menu. Selecting a program step positions the program
pointer on that step. This is equivalent to the real HP15C sequence GTO CHS # # #, where "#" means a digit key. This sequence is not supported by the Simulator. 
Program (PRGM Mode)
Keyboard  HP15C key  Function 

Ctrl–F1 Shift–F1 
  Displays the help file of the current program (if available). 
F2 , O  GTO  GoTO. Must be followed by a (valid) program label. Insert a GoTo statement in the current program. 
F3 , B  GSB  GoSuB. Must be followed by a (valid) program label. Insert a GoSub statement in the current program. 
F4  g RTN  ReTurN. Insert a Return statement in the program. 
F5 , V  R/S  Run/Stop. Insert a stop statement in the program. 
F6  f PSE  PauSE. Stops the program for a short time and continuous. The duration of the pause statement can be configured in the Preferences dialogue box. 
F8  f LBL  LaBeL. Defines the start of a program or subprogram. Must be followed by a valid program name. 
F9  g P/R  Program/Run mode. Switches back to Run mode. Mac OS X: ⌘–F9 
F11    Toggles program mnemonics in menus on/off. Mac OS X: ⌘–F11 
Alt–F11    Toggles coloured program menus on/off. 
F12 , Ctrl–D    Opens the Program Description dialogue box. Used to edit/enter program documentation 
←  g BST  Backward STep. Moves the program pointer one step back. Line number and contents of the new current step will be displayed. 
→  SST  Single STep. Moves the program pointer one step forward. Line number and contents of the new current step are displayed. 