Boriel ZX Basic

Build Status license pyversions


Copyleft (K) 2008, Jose Rodriguez-Rosa (a.k.a. Boriel)

All files within this project are covered under de LGPL3-like LICENSE (Read

You can create closed-source (even commercial ones!) programs with this compiler (a mention to this tool will be welcome, though). But you are not allowed to release the compiler itself as a closed Source program.

If you modify this project (the compiler .py, .asm or whathever) files in any way you MUST publish the changes you made and submit your contribution to the community under the same license.


This is a very little help file.

For DOCUMENTATION in English go to the ZX BASIC Wiki:

For help, support, updates meet the community at my forum:


Go to the ZXBasic download page and get the version most suitable for you.

There are, basically, two flavors (both with identical capabilities):

  • For Windows you can download de win32 executable (Windows .exe zip package) version. To install just uncompress it in a directory of your choice. The main executable is zxb.exe (more on this later). With this toolchain also comes zxbasm.exe (the assembler) and zxbpp.exe (the preprocessor), but these are not needed when programming in BASIC.

  • For Linux and Mac OSX there is a python version, so you will need a python interpreter (available on many platforms, and usually already installed in Linux and Mac OSX). Just uncompress it in a directory of your choice and installation is done. :-) The main executables are (the compiler), (the assembler) and (the preprocessor). You can use this version in Windows, but will need to install a python interpreter first.

Eleuterio, el mono serio El Hobbit Knight & Demonds DX
An in-game screenshot of Eleuterio by @na_th_an Ingame screenshot of El Hobbit by @Wilco2000 Ingame screenshot of Knignt and Demonds DX by Einar Saukas

See more examples at


For a quick start, just open a terminal in your PC in the same directory you uncompressed ZX Basic and type zxb (on Windows) or (OSX, Linux). You should see a zxbasic message like this:

usage: zxb [-h] [-d] [-O OPTIMIZE] [-o OUTPUT_FILE] [-T] [-t] [-B] [-a] [-A]
           [-S ORG] [-e STDERR] [--array-base ARRAY_BASE]
           [--string-base STRING_BASE] [-Z] [-H HEAP_SIZE] [--debug-memory]
           [--debug-array] [--strict-bool] [--enable-break] [-E] [--explicit]
           [-D DEFINES] [-M MEMORY_MAP] [-i] [-I INCLUDE_PATH] [--strict]
zxb: error: the following arguments are required: PROGRAM

Create a text file with the following content:

10 CLS

Save it as hello.bas and finally compile it with:

zxb -taB hello.bas

If everything went well, a file named hello.tap should be created. Open it with your favourite emulator (i.e. fuse) and see the result.

Congratulations! You're now ready to create compiled BASIC programs for your machine. Check and compile the examples included in the examples/ folder or go to the Wiki for further info.


These are some people who has contributed in a way or another. I consider some of them co-authors (Britlion, LCD) of this project.

Thanks to:

If you have contributed in some way to this project, please, tell me so I'll add you to this list.