Skip to main content

A compiler targeting the Commodore 64

Project description


Build Status AppVeyor Coverage Status Requirements Status

jeff65 is a compiler for the Commodore 64 (and perhaps in the future, other 6502-based computers). It is implemented in Python 3 and produces .prg files which can be loaded directly in VICE, or combined into .d64 disk images, written to a floppy disk, and run on real hardware.

note: this project is currently in its early stages. Features discussed below are largely the product of wishful thinking and may change at any time.

jeff65 compiles languages using gold syntax, producing blum files as intermediate files. gold syntax provides an imperative systems language for 6502-series processors.

Primary invocation:

usage: jeff65 compile [-h] [-v] file

positional arguments:
  file           the file to compile

optional arguments:
  -h, --help     show this help message and exit
  -v, --verbose  show the output of each pass


The jeff65 compiler itself is provided under the GPLv3 license; if you distribute a modified version of the compiler, you must also make the source code for your modified version available, as described in the license terms. A copy of the GPLv3 license is included in LICENSE.txt in the source distribution.

The standard library units and runtime library, whenever they get written, will probably be provided either using the GPL with a linking exception, or under a non-copyleft license.


Gold-syntax provides an imperative systems programming language for 6502-series processors. Features of the processor are exposed in a friendly-but-powerful way; it should be possible to understand what code will be generated by looking directly at the source file.

Gold-syntax is not associated with the Gold parser framework or the gold LLVM linker.

Here is an example file which puts a light red heart to the top-left corner of the screen, which actually works with the compiler in its current, very unfinished, state:

use mem

constant screen-corner: &u8 =
constant screen-corner-color: &u8 =

fun main()
  @screen-corner = 0x53      /* screencode for <3 */
  @screen-corner-color = 10  /* light red */

Project details

Release history Release notifications

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
jeff65-0.0.1-py3-none-any.whl (48.1 kB) Copy SHA256 hash SHA256 Wheel py3 Aug 29, 2018
jeff65-0.0.1.tar.gz (34.4 kB) Copy SHA256 hash SHA256 Source None Aug 29, 2018

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page