jkotlinski/durexforth

Modern C64 Forth

271

stars

2,584

commits

Forth

primary language

Jun 25, 2026

updated

6502

6510

c64

forth

README

durexforth

Modern C64 Forth. Includes a vi clone written in Forth, a high-resolution graphics library, plus MML music support.

Latest Release :: Manual

Goals

Fun. The system should be nice to work with on the real machine.
Fast. DurexForth is the <a href=https://theultimatebenchmark.org/>fastest C64 Forth, running at ~50x the speed of Basic V2!
Easy to use. Implements the <a href=http://forth-standard.org/standard/words>Forth 2012 core standard, learn it with <a href=https://www.forth.com/starting-forth/>Starting Forth!

Testimonials

C64 Programming May the Forth be with you Pt 1 - YouTube

C64 Programming Into the Forth Dimension Pt 2 - YouTube

A Brief Introduction to DurexForth for the Commodore 64

"Just fooling around but Durexforth is fast and fun!" -Kevin Reno

"Ich finde das Forth klein und effektiv, wunderbar." -Peter Bierbach

"Ist eine mächtige Sprache für ein 8-Bitter." -Pebisoft

"The author of durexForth was quite helpful... There is even a vim-like editor, impressive for being on a C64." -Christian Johansson

Contributors

2,472 commits

57 commits

24 commits

10 commits

See what people are saying

Hacker News (1)

Sectorforth is a 16-bit x86 Forth that fits in a 512-byte boot sector (2020)

0 points · Aug 20, 2026

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jkotlinski/durexforth

Modern C64 Forth

271

stars

2,584

commits

Forth

primary language

Jun 25, 2026

updated

6502

6510

c64

forth

README

durexforth

Modern C64 Forth. Includes a vi clone written in Forth, a high-resolution graphics library, plus MML music support.

Latest Release :: Manual

Goals

Fun. The system should be nice to work with on the real machine.
Fast. DurexForth is the <a href=https://theultimatebenchmark.org/>fastest C64 Forth, running at ~50x the speed of Basic V2!
Easy to use. Implements the <a href=http://forth-standard.org/standard/words>Forth 2012 core standard, learn it with <a href=https://www.forth.com/starting-forth/>Starting Forth!