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by mras0 510 days ago
Good luck! As the sibling comment mentions, Asm-Pro is IMO a good choice these though it requires KSv2+ (so you can't use it on an stock A500). I mostly use vasm for "larger" stuff though (http://sun.hasenbraten.de/vasm/) and cross-compile (though it can run on Amiga as well) / test in an emulator.

For a quick test/code loop nothing beats the Asm-* family - remember to save often and make backups though :)