Does anyone know a reasonably good (and properly licensed) 6502 assembler written in actual machine code, which I can run _on_ a 6502 machine? I'm looking for something simple that will just read a text file of some kind of file system, assemble it, write something back, and terminate. No editor or debugging support required.

http://thewessens.net/collection/apple1/Krusader.htm, perhaps?

@ass maybe? http://www.6502.org/users/andre/misc/

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Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/

A few related prior discussions:

viewtopic.php?f=2&t=6475 where Gragathaz talks about his Editor Not Included Assembler - currently inaccessibly stuffed away is a storage.

https://atariwiki.org/wiki/Wiki.jsp?page=BiboAssembler - an Atari 8-bit assembler

https://www.commanderx16.com/forum/inde ... mment-7183

Rich Leary wrote one for his DOS/65 system. I recently ported it over to WDC Tools and have it running on my C02 Pocket SBC (under DOS/65 of course).

I used it assemble several of the DOS/65 tools and utilities, like the basic compiler, runtime, editor, etc.

According to the source file, this was written by Rich and nobody else. His license for DOS/65 is pretty simple.

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Regards, KM
https://github.com/floobydust

I've looked at the DOS/65 assembler --- it'd be ideal if it weren't for the no-commercial-use license license...

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Hmmm... I went back to all of the documentation and code that Richard sent me last year. In his Version 2.1 documentation, he specifically states:



In his more recent V3 ROM version, he's changed to a GNU GPL V3 license and states:



Not sure if the license change helps in this situation, but he does include all other DOS/65 software, so that( would/should/could) include previous versions.

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Regards, KM
https://github.com/floobydust

You might have a look at my assembler: https://github.com/Dietrich-L/CPM-65/tree/main/ASM

It was optimized for speed and assembles 35 lines/s or 0,45 kB code/s nearly indepentent of the size of the source on my 1 MHz Elektor Junior Computer. My largest source was 70 kB with 5000 lines resulting in 10 kB code.

Dietrich

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My system: Elektor Junior Computer, GitHub https://github.com/Dietrich-L

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

(Welcome, Dietrich, you have shown enormous self-control in making your first post nearly 20 years after signing up!)

Well, unfortunately no 65C02 support, mainly because I don‘t have one.

With regard to self control - it was more an issue between ignorance, lacking competence and laziness on my part

But if my code is of use for somebody, it is worth any effort

Dietrich

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My system: Elektor Junior Computer, GitHub https://github.com/Dietrich-L

I did not know this project existed! Oh, well, I wasn't using those 45 hours of my life anyway...

There's definitely stuff I can steal here; your BDOS seems to be a lot smaller than mine. It's a little simpler due to not needing to be relocatable but that doesn't account for a lot of it. I think I can do a lot of optimisation.

I've also observed (through an attempt to write my own assembler) that requiring relocatable output makes things much more complicated. It requires tracking the types of expressions so as to know whether they're relocatable addresses or not, as well as needing somewhere to put the relocation table during assembly. I was primarily thinking that would happen via creating an object file and then linking, but this rules out simple assembler-loaders, which is unfortunate. It is possible to assemble the file three times at slightly different addresses and then comparing the results to figure out what needs relocation, but that's really slow and I was hoping not to have to.

Many thanks for sharing your code, Dietrich, and breaking your habit of silence!

I'd say it was worth the wait! I've been looking through Dietrich's repository and there is a tremendous amount of work there.

Another open source assembler not mentioned here is the one included in Craig Bruce's ACE operating system, which Craig released as public domain:

• Documentation: as-doc.html
• Source Code: as.s, ashelp.s

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- Mike Naberezny (mike@naberezny.com) http://6502.org