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# BRLTTY Reference Manual

## Access to the Console Screen for Blind Persons using Refreshable Braille Displays

## Nikhil Nair `<nn201@cus.cam.ac.uk>`

## Nicolas Pitre `<nico@fluxnic.net>`

## Stéphane Doyon `<s.doyon@videotron.ca>`

## Dave Mielke `<dave@mielke.cc>`

Version 6.4, September 2021

Copyright © 1995-2021 by The BRLTTY Developers. BRLTTY is free software, and comes with ABSOLUTELY NO WARRANTY. It is placed under the terms of version 2 or later of The GNU General Public License as published by The Free Software Foundation.

## 1. Formalities

- 1.1 License
- 1.2 Disclaimer
- 1.3 Contact Information

## 2. Introduction

- 2.1 Feature Summary
- 2.2 System Requirements

## 3. The Build Procedure

- 3.1 Installed File Hierarchy
- 3.2 Installing from a TAR Ball
- 3.3 Testing BRLTTY
- 3.4 Starting BRLTTY
- 3.5 Security Considerations
- 3.6 Build and Run-Time Restrictions
- 3.7 Installing from an RPM File
- 3.8 Other Utilities

## 4. Using BRLTTY

- 4.1 Commands
- 4.2 The Configuration File
- 4.3 Command Line Options

## 5. Feature Descriptions

- 5.1 Cursor Routing
- 5.2 Cut and Paste
- 5.3 Pointer (Mouse) Support via GPM
- 5.4 Alert Tunes
- 5.5 Preferences Settings
- 5.6 The Status Display
- 5.7 Command Learn Mode

## 6. Tables

- 6.1 Text Tables
- 6.2 Attributes Tables
- 6.3 Contraction Tables
- 6.4 Key Tables

## 7. Advanced Topics

- 7.1 Installing Multiple Versions
- 7.2 Installation/Rescue Root Disks for Linux
- 7.3 Future Enhancements
- 7.4 Known Bugs

## Appendix

## 8. Supported Braille Displays

## 9. Supported Speech Synthesizers

## 10. Driver Identification Codes

## 11. Supported Screen Drivers

## 12. Operand Syntax

- 12.1 Driver Specification
- 12.2 Braille Device Specification
- 12.3 PCM Device Specification
- 12.4 MIDI Device Specification

## 13. Standard Braille Dot Numbering Convention

## 14. North American Braille Computer Code

## 15. MIDI Instrument Table

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