All early Texas Instruments calculators, including the SR-52 and the TI-59 used the INV key for many functions: **INV** **SBR** to return from a subroutine, **INV** **Ln** to calculate the exponential, or **INV** **EE** to cancel scientific display mode are just some of the examples of this key's usage. The TI-88 is no exception; there are many uses of the **INV** key on this machine, some of them less than obvious.

INV Σ+ |
Remove statistics data point | |

INV P-R |
Rectangular to polar conversion | |

INV OP nn |
Display OP code function (do not execute) | |

INV CMs |
Clear program memory | |

INV SBR |
Subroutine return | |

INV Log |
Common antilogarithm | |

INV Ln |
Natural antilogarithm | |

INV GFR |
Go backward relative | |

INV EE |
Cancel scientific display mode | |

INV Time |
Display date | |

INV Eng |
Cancel engineering display mode | |

INV Fix |
Cancel fixed-point display mode | |

INV Int |
Calculate fractional part | |

INV DRG |
Set to degrees mode | |

INV If> |
If less than | |

INV If= |
If not equal | |

INV Dsz |
Decrement and execute on zero | |

INV IfF |
If flag not set | |

INV StF |
Clear flag | |

INV sin |
Arc sine | |

INV cos |
Arc cosine | |

INV tan |
Arc tangent | |

INV Lst |
List data memories | |

INV Prt |
Advance printer | |

INV Trc |
Cancel trace mode |