# Documentation

There are many resources for documentation about the project.

## Tutorial

Here is a quick tutorial to get you started with DB48X.

### Try this: Plotting a function

Try the following key sequence, where you need to hit the Shift key as a separate key, and observe what happens with each key:

Key to type | What happens |

F | Enter expression |

Shift | Left Shift |

ENTER | ALPHA mode |

X | Enter variable name X |

ENTER | Put X on the stack |

ENTER | Duplicate X |

3 | Enter number 3 |

. | 3. |

4 | 3.4 |

2 | 3.42 |

* | Put 3.42 times X on stack |

J | Compute sin(3.42·X) |

M | Swap stack levels 1 and 2 |

K | Compute cos(X) |

/ | Compute sin(3.42·X)/cos(X) |

Shift | Left shift |

N | Select MODES menu |

F2 | Select Radians mode |

Shift | Left Shift |

Shift | Right Shift |

O | PLOT menu |

F1 | Draw function |

### Try this: Computing 200 digits of pi

Try the following key sequence, where you need to hit the Shift key as a separate key, and observe what happens with each key:

Key to type | What happens |

Shift | Left Shift |

N | MODES menu |

F2 | RADIANS mode |

Shift | Left Shift |

O | DISP menu |

2 | Enter number 2 |

0 | 20 |

0 | 200 |

F6 | 200-digit precision |

Shift | Left Shift |

M | Last Arg (Recall 200) |

F5 | 200 significant digits shown |

1 | Enter number 1 |

Shift | Left Shift |

L | Compute arc-tangent of 1 |

4 | Enter number 4 |

* | Compute pi |

Shift | Left Shift |

. | SHOW function (show full screen) |

## Videos

There is a video playlist on YouTube containing many demos, installation procedures, and more.

## On-line reference

The reference documentation for the project is available online. It is the same content that is also installed on the calculator for the built-in help.

## Comparison with other projects

The project includes comparisons with other third-party firmware for SwissMicros calculators to help you pick a program that suits your needs best.

There is also a page highlighting the differences and similarities with the DM42.

## Forums

There are active discussion forums on the museum of HP calculators web site, notbly a dedicated thread, and on the SwissMicros forum.

## Keyboard overlays

Keyboard overlays can be ordered to make it easier to use the firmware on a physical calculator.