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zasm: document lack of support for undocumented instructions
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@ -152,4 +152,11 @@ allowed. An included file cannot have an `.inc` directive.
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in the argument in the currently active filesystem and outputs its
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in the argument in the currently active filesystem and outputs its
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contents directly.
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contents directly.
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## Undocumented instructions
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`zasm` doesn't support undocumented instructions such as the ones that involve
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using `IX` and `IY` as 8-bit registers. We used to support them, but because
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this makes our code incompatible with Z80-compatible CPUs such as the Z180, we
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prefer to avoid these in our code.
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[libz80]: https://github.com/ggambetta/libz80
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[libz80]: https://github.com/ggambetta/libz80
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