# PrimeComm: reconstructing HP Prime file communication

> PrimeComm implements file communication with the HP Prime calculator from the author's device reverse engineering. It provides a Windows GUI, PrimeCmd command-line access and PrimeLib for sending, receiving and converting calculator programs; the author says modern firmware changed the communication protocol.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/eried/PrimeComm>
- Primary source: <https://github.com/eried/PrimeComm/blob/a0ac20e65cdd97695bdc51bd1f319c973b51937a/README.md>
- Catalog page: <https://awesomerea.org/resources/primecomm-hp-prime-case/>
- Record JSON: <https://awesomerea.org/resources/primecomm-hp-prime-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/primecomm-hp-prime-case/index.md)

## Requirements & limits

- An HP Prime calculator with firmware compatible with the older communication protocol.
- The author says the project does not work with modern firmware.

## Primary sources

1. <https://github.com/eried/PrimeComm/blob/a0ac20e65cdd97695bdc51bd1f319c973b51937a/README.md>

## More in Protocols

- [MicronetToNMEA: reconstructing a marine instrument radio bridge](https://awesomerea.org/resources/micronet-to-nmea-case/index.md) · Case study
- [openmili: implementing the Mi-Light 2.4 GHz control protocol](https://awesomerea.org/resources/openmili-case/index.md) · Case study
- [AcuRite 00592TX: decoding wireless temperature frames](https://awesomerea.org/resources/acurite-00592tx-protocol-case/index.md) · Case study
- [DIY Saab 9-3 Tachometer: decoding CAN signals for RPM and speed](https://awesomerea.org/resources/diy-saab-9-3-tachometer-case/index.md) · Case study
- [free-outernet: reconstructing Outernet broadcast services](https://awesomerea.org/resources/free-outernet-protocol-case/index.md) · Case study
- [MikroTik WinBox Terminal Client: implementing the terminal protocol](https://awesomerea.org/resources/winbox-terminal-protocol-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.