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I have a hobby project with an old CP/M-80 system, where I now would like to disassemble/decompile some compiled code – a ROM and some small executables – into assembly source so I can regenerate the exact same binary. I have an emulator running on macOS.

I have previously played a bit with REZ (the Z80 version of RESOURCE) which was nice but I was wondering if there are better tools now 30 years later running on modern equipment. IDA Pro supports Z80 and looks very powerful but the price is a bit higher than I’d like.

What should I have a look at?

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    Oh so many for the 6502. Mostly Javascript. I blame NES.
    – Brian H
    Commented Jun 28, 2021 at 15:29
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    There's also this: z88dk.org. I have never used it and I have no idea how good it is. You can try it out with C on godbolt.org though.
    – Lundin
    Commented Oct 14 at 13:07

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The old IDA freeware ver.3.7 supports Z80. It has a Turbo Vision style interface, which may be something that puts you off. It is also no longer distributed officially. However, it is very powerful, and if you can live with its quirks, you will be able to find it on many abandonware websites.

Alternatively, a lot of people started switching to NSA-developed Ghidra: https://ghidra-sre.org/. It is quite powerful, supports Z80, and is also free and open source. The only obvious downside to it is that it is a several hundred Mb download, vs. several megabytes of IDA free 3.7.

Interestingly, 8 years ago a closely related question was asked over at Reverse Engineering StackExchange: "Is there any disassembler to rival IDA Pro?" Their answers are not specific to Z80, of course, but two interesting disassemblers mentioned there feature support for Z80 and may prove useful too. They are called radare2 and the Online Disassembler.

Over the years, many small(er) disassemblers and disassembling tools have been developed either generally for Z80, or for specific computers based on Z80. A selection of several generic tools for disassembling Z80 code is presented here: http://www.z80.info/z80sdt.htm#SDT_DISASM. In my mind, this selection is very dated, yet, some of the tools there can still be useful.

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  • Having spent quite a bit of my youth in Turbo Pascal 5.5 I am fine with Turbo Vision. I'll have a look at both - Ghidra looks promising as well.
    – Thorbjørn Ravn Andersen
    Commented Jun 27, 2021 at 16:56
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    Ghidra, though huge and with a monster learning curve (tip: do the tutorial! If you don't think you need to do the tutorial, Ghidra will laugh at you) is absurdly powerful. It's also cross-platform. I was very impressed that it turned a random blob of 8051 binary into "I can see what this does!" source — and I don't even know any 8051!
    – scruss
    Commented Jun 27, 2021 at 17:13
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    I had a quick look at the online disassembler. It hung on my machine while loading a 2Kb image. This might be an adblocker problem though.
    – Thorbjørn Ravn Andersen
    Commented Jun 28, 2021 at 14:35
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    @ThorbjørnRavnAndersen: My biggest expriment was to disassemble a 1K intro. It did seem to freeze at one point, but simply reloading the page helped in my case.
    – introspec
    Commented Jun 28, 2021 at 15:17
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    The online disassembler at that URL is dead. By Googling I found a site with a similar name but I have no idea if it's the same project: shell-storm.org/online/Online-Assembler-and-Disassembler so I didn't just replace the URL.
    – hippietrail
    Commented Oct 13 at 6:48

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