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Reservoir Gods bring you a brand new cross platform host assembler and linker for Atari 680x0 development.
 
rg-asm is a universal assembler, supporting the entire 68k family from 68000 to 68060, 68881/68882 FPUs and all Coldfire CPUs.
 
Compatible with a huge range of existing atari assemblers (Devpac, vasm, rmac & more) your existing code will just work, no changes needed:
 
Output includes GEMDOS PRG executables, linkable objects for C toolchains, and raw binaries. 
 
Symbol tables can be embedded (DRI, GST) or written as extern sidecars.
 
rg-asm v0.7.0 output
  
Built on a full 680x0 emulation core, rg-asm reports per-instruction cycle costs on each CPU, understands 68000/010 pipeline pairing, and can not only optimisze for size but also peephole optimise and reorder instructions to be more efficient.
 
Metrics include per instruction diagnostics of CPU costs, function and application level sizes and cycle costs.
 
All the metrics can optionally be output to JSON for processing by other tools.
 
It's a single binary with no dependencies. Just unzip and run.
 
 
 

Comments

Marcus
Thursday, 30 July 2026 21:31
A big release. such thing I have been waiting for. as I have alot of collected old sources from different assemblers / even different versions of devpac etc..

Great work.. but there is a little.. But.. this tool crashes on my win7 system. what am I doing wrong?
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pink
Thursday, 30 July 2026 23:07
Rust dropped support for Windows 7 a couple of years ago; we should have made this clearer that the base Windows version required is Windows 10 for this application.

However, we have now created a Windows 7 version of the tool, just published to the website. Requires 64-bit and SP1 for Windows 7. Give that version a spin.
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CiH_
Friday, 31 July 2026 05:06
I heard about this a few hours ago.

Hope there's some killer games coming through, or some of the long-lost RG projects finally coming home.
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CiH_
Friday, 31 July 2026 05:45
The assembler is a massive piece of work.

Thank you! (A grateful Atari scene. )
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nokturnal
Friday, 31 July 2026 06:56
Thanks! Great project, it took me by suprise.. @mr.pink There's hint on website that there will be more in dev tools departament, what is it? or is it top secret for now? :)
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pink
Saturday, 01 August 2026 16:28
@nokturnal - we are working on a full suite of atari development tools. nothing official to announce yet, but should be some more releases over the next month.

@CIH - have been retrieving some old floppy disks that have been in a barn for 20 years, found all sorts of interesting unfinished projects ..
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CiH_
Saturday, 01 August 2026 20:27
Pure speculation on the part of brain fade and poor quality functionality in general from me.

Order of plausabilty for RG project revival.

1. Puzzle Bobble.
2. Republic
3. GodlyNES, the next generation.
4. 'Godscape', the Netscape Navigator smashing Interweb browser for the Falcon.
5. The boat race simulator being coded at Symposium 96.

*None* of these are serious suggestions and shouldn't be taken as such for wild rumour creation. I'm sure more will be revealed when he's ready.
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