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On ZX Spectrum, they took this even further developers are challenging emulators real hard with a game that specifically relies on a weird undocumented behaviour of the Z80: games like [https://spectrumcomputing.co.uk/entry/31198/ZX-Spectrum/MEMPTR_Snake MEMPTR Snake] and [https://spectrumcomputing.co.uk/entry/31261/ZX-Spectrum/Chromatrons_Attack Chromatrons Attack]
There is also this initiative for emulators who willingly want to be detected: An [[Emulator_IDs|Emulator IDs]]system also exist for CPC emulators to be easily detected.
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