There has been several implementations of Forth that were running on, and targeting, the C64. Were there any commercial software releases (not throw-away hobby projects or in-house utilities) that were implemented in such a Forth system? The more widespread the better; my favorite would be if there was a released game.

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    @BrianH whoa really? Talk about a household name... You got a source for that? – Cactus Aug 15 '19 at 15:09
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    @BrianH elitehomepage.org/faq.htm shows Elite was written in assembler. I do remember reading about another space game that was written in a Forth dialect, but can't remember the name. – UncleBod Aug 15 '19 at 15:58
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    Yeah. I have a distinct memory of reading about an early space game written in Forth, but can't find the info now. – Brian H Aug 15 '19 at 17:03
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    @BrianH Starflight was written in Forth, at least for DOS. I'm not sure if other versions were in Forth but I believe it is unlikely as they were written 3 or 4 years later. – Tim Locke Aug 15 '19 at 17:59
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    I remember that Adventure Construction Kit was supposed to be implemented using Forth, but I can't find anything to confirm that other than how painfully slow it ran. – Ross Ridge Aug 16 '19 at 19:45

Amnesia (Electronic Arts) is probably the most famous one. The King Edward Adventure Game system was just a wrapper.

Hard Hat Mack (Electronic Arts) copy-protection was written partially in Forth.

Among educational titles, Davidson and Associates published a few, like Alge-Blaster and Read 'N Roll.

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I wrote C64-Forth way back in the early 80's (we sold it to Commodore but they disbanded their software products group shortly thereafter and it never made it out of the loading dock). Had some interesting users of it, including Lawrence Livermore Labs.

Portions of it were in assembler. All the math was implemented by calling the C64's internal ROM math code, so it's fast. I did one unusual thing - I stuck with C64's normal file structure. This meant you didn't need Forth-formatted floppy disks - in Forth, you could read and write normal data files, and you could read/write C64-Forth data from Basic or assembler.

Should anyone come across a copy of it, I still have a manual for it. I'd consider scanning it in or photocopying it. Gregg

Update: Following advice below, I have scanned in the manual (to two PDF files) and uploaded them to: https://archive.org/details/c64forthmainmanual. I will occasionally monitor this thread and would like to hear from anyone who actually runs it (I don't know if the version available at the site named below has copy-protection defeated. It may not be runable as is). If someone wishes to have a more extensive discussion of their experience with it, leave a message here, I'll create a temporary email address and post it here, and we can keep in touch.

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    Scanning in the manual would be much appreciated, regardless of whether a copy can be found – you can post it on the Internet Archive so it'll stick around for decades, if not centuries. – wizzwizz4 Oct 16 '19 at 16:43
  • Am I correct thinking that you are referring to this one: csdb.dk/release/?id=159141 ? – introspec Oct 16 '19 at 19:42
  • Introspec - yes, that’s it. I’ll investigate if local shop can scan manual in. It was something like 120+ pages. Had full floating point math, sprite manipulation, and more. – gh86 Oct 17 '19 at 20:19
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    Almost more important than the Manual would be any kind of surviving development docs, notes, and alike. At least for historic research that is. – Raffzahn Oct 18 '19 at 9:59
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    @gh86 If you're not locked out of your account, Retrocomputing Chat would be better than a private email conversation. – wizzwizz4 Nov 11 '19 at 21:48

I worked for a company called ibidinc in the 80s. We released an adventure game called THE ALPINE ENCOUNTER in 1985. It was written in Forth, so we were able to release simultaneously on the Apple II, Commodore 64, and IBM PC. There were plans for a sequel but they never came to fruition.

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