# Unisonic 1099-A

The Unisonic 1099-A is a scientific calculator with algebraic logic. It has a VFD (vacuum fluorescent) display. The power source is 4xAAA.

## Facts at a glance:

Feature | Value |
---|---|

Type | Scientific |

Logic | Algebraic |

Display type | VFD |

Length | 140mm |

Width | 83mm |

Power Source | 4xAAA |

Year introduced | 1975 |

## Replacements:

If you have a Unisonic 1099-A that is no longer working, you can first try replacing the 4xAAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement: