---
title: "casio_fx: documenting Casio calculator serial transfers"
url: https://awesomerea.org/resources/casio-fx-case/
updated: 2026-11-08
type: resource
---

# casio_fx: documenting Casio calculator serial transfers

> casio_fx implements Linux serial transfers for Casio calculators and documents their section-based message exchange and CAS file structure. Its send and receive utilities handle program data for fx-7700GB and fx-7700GE; a converter turns supported monochrome CAS screen dumps into PBM images.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/tarapitha/casio_fx>
- Primary source: <https://github.com/tarapitha/casio_fx/blob/4f894245ffb7b967628e0fbd1ff823f9164dbeeb/README.md>
- Catalog page: <https://awesomerea.org/resources/casio-fx-case/>
- Record JSON: <https://awesomerea.org/resources/casio-fx-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/casio-fx-case/index.md)

## Requirements & limits

- **Prerequisites:** Linux and a suitable serial connection with compatible voltage levels are required.
- **Scope:** Program transfer is documented for fx-7700GB and fx-7700GE; monochrome screenshots were tested with CFX-9850G.
- **Limits:** Other data communication functions are not implemented.
- **License:** GPL-3.0 license.

## Primary sources

1. <https://github.com/tarapitha/casio_fx/blob/4f894245ffb7b967628e0fbd1ff823f9164dbeeb/README.md>
2. <https://github.com/tarapitha/casio_fx/blob/4f894245ffb7b967628e0fbd1ff823f9164dbeeb/PROTOCOL.md>
3. <https://github.com/tarapitha/casio_fx/blob/4f894245ffb7b967628e0fbd1ff823f9164dbeeb/CAS_FILE.md>

## More in Protocols

- [Falmec Nuvola 90: reconstructing a 433 MHz remote protocol](https://awesomerea.org/resources/falmec-radio-case/index.md) · Case study
- [HeronSquawk: reconstructing RYLR999 LoRa framing for a mesh network](https://awesomerea.org/resources/heronsquawk-case/index.md) · Case study
- [TP-Link SG3428: reconstructing its USB console access](https://awesomerea.org/resources/tplink-sg3428-usb-reset-case/index.md) · Case study
- [ak820-linux: reconstructing AJAZZ AK820 Pro USB control](https://awesomerea.org/resources/ak820-linux-case/index.md) · Case study
- [LUMIX Remote: reconstructing Panasonic S5 camera communication](https://awesomerea.org/resources/lumix-remote-s5-case/index.md) · Case study
- [fix-whxm4-voice: reconstructing WH-1000XM4 voice-pack upload](https://awesomerea.org/resources/fix-whxm4-voice-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.