Durex Forth v1.0

Durex Forth v1.1

Durex Forth 1.1

Durex Forth v1.2

Durex Forth v1.21

Durex Forth v1.22

Durex Forth v1.23

Durex Forth v1.24

Durex Forth v1.25

Durex Forth v1.26

Durex Forth v1.27

Durex Forth v1.28

Durex Forth v1.30

Durex Forth v1.31

DurexForth is a half-minimalist C64 Forth inspired by colorForth, JONESFORTH and Blazin' Forth. PDF manual is included inside the archive.

Durex Forth v1.33 with PDF manual included.

Durex Forth v1.4

Durex Forth v1.4.1

Durex Forth 1.4.3- Manual included in archive

• forth: added u. unloop leave cell+ cells page key?
• forth: allow input of negative numbers
• forth: optimized cmove, cmove>
• forth: made . print signed numbers
• forth: various bugfixes
• doc: simplified & improved intro + tutorial, minor improvements
• vi: bugfix, exiting editor disabled key repeat

• forth: / now uses floored signed division
• forth: bugfix for negative number parsing (2- was interpreted as -20)
• forth: made 2/ sign-extend negative numbers
• forth: added spaces source >in 2over 2swap m+ m* sm/rem fm/mod dabs dnegate s>d
• forth: changed word order of double-cell integers
• vi: backspace on start of line now doesn't join lines
• doc: mention in tutorial that default is hexadecimal

• bugfix: disabled tail call elimination for literal ['] [char] to avoid some crashes
• bugfix: <, rshift, u. did not support negative numbers
• forth: made word finding + numbers case insensitive
• forth: renamed char to getc, and added a new char that works according to the Forth 2012 standard.
• forth: added abort, abort", 2@, 2!, char+, chars, align, aligned
• forth: key, key? now work only with keyboard
• forth: made quit reset input and fall back to keyboard
• forth: fill ( ch addr len ) changed to fill ( addr len ch )
• forth: allot ( -- n ) changed to allot ( -- )
• forth: made base a variable instead of a value
• forth: changed variable; data field is now after code field

• forth: made +loop work according to standard
• forth: added support for #, $, %, char parsing. e.g. #123, $d020, %1001001, 'z'
• forth: ' now aborts if it does not find a word
• forth: made "type" disable c64 quote mode (fixes "words")
• forth: state ( -- flag ) changed to state ( -- addr )
• forth: added count, >body, <#, #>, hold, sign, #, #s, >number, move, accept
• forth: removed hide, hide-to, hidden, forget, scratch, cmove, cmove>
• forth: fixed yet another tail call elimination crash
• forth: made while/repeat implementation conform to standard
• forth: made word conform to standard
• forth: made "immediate", "no-tce" non-immediate
• forth: made sure immediate does not toggle

2016-01-10: v1.5.1 - bugfix & improvements

• bugfix: evaluate and vi F7 didn't work for multi-line buffers
• bugfix: see did not work on the latest word
• bugfix: e.g. 'A' was parsed as 'a'
• bugfix: case insensitivity did not work for z/Z
• editor: use fg to bring back editor instead of RESTORE
• disk: added include (e.g. "include gfx" loads gfx module)
• disk: added device ( device# -- ) to switch active device
• disk: renamed load => included
• forth: added marker
• forth: made dump work in decimal mode
• forth: made .( immediate
• forth: removed no-tce
• forth: bring back modules

Various bug fixes for evaluate/vi f7.

• bugfix: vi :w didn't work with filenames longer than 6 characters
• bugfix: vi :w! captured control characters in filename
• bugfix: changed vi :w to avoid 1541 bugs
• vi: improved feedback when saving
• vi: stop using backup files
• forth: added require, required
• doc: documented assembler, sid

• forth: now available as a 16 kB cartridge image. the cartridge has the same functionality as the disk version, but boots faster.
• forth: removed gfx from standard modules
• forth: dropped all usage of BASIC (including float module)
• forth: moved rarely used words to compat module
• asm: renamed zptmp zptmp2 zptmp3 => w w2 w3
• asm: renamed sp0 sp1 => lsb msb
• gfx: moved bitmap graphics area from $8c00-$8fff, $a000-$bfff to $cc00-$cfff, $e000-$ffff
• doc: expanded assembler documentation
• editor: removed fg

2016-02-10: v1.6.1

• forth: evaluate failed for strings that ended at page boundary
• forth: print error in case include fails
• forth: space optimize of
• forth: moved 2over, 2swap to compat
• cart: made cartridge boot faster
• cart: use Simons' Basic cart type to make $a000-$bfff RAM
• editor: starting without filename now doesn't read from disk
• editor: :w on unnamed buffer now prints "no filename"

• micro optimizations
• "see" improvements
• removed "sei" and "cli"
• flash screen when reading from disk
• moved ">body" to compat
• added methods for reading jiffy clock in timer.fs
• improved stack underflow detection
• changed save-forth syntax from s" foo" save-forth to save-forth foo
• bugfix: save-forth now works from cartridge (thx corey minter)
• bugfix: ar/yr/xr docs (thx corey minter)

Durex Forth 1.6.4 - Released April 22, 2018

Durex Forth 1.6.8 - 5-22-2019

[Changed]

• when parsing, treat shift+space like space. it used to
  be like this but accidentally (?) changed in 1.6.0.

DurexForth 2.0.0 - A modern implementation of Forth on the Commodore 64.

Released March 22nd, 2020 - Archive includes manual, source, .d64 floppy image and .crt cartridge image.

Forth is a unique language. What is so special about it? It is a small, low-level language, which can easily be extended to a high-level, domain-specific language that does anything you want it to. Compared to C64 Basic, Forth is more attractive in almost every way. It is a lot faster, more memory effective, and more powerful.

Compared to C, the nice thing about Forth is that you can run the full development environment on your C64, with text editor, compiler, assembler and debugger. It makes for a more interactive and fun experience than running a cross-compiler on PC.