If you want to promote usage of real CPC computers, you can detect CPC emulators by:
*Checking if the memory is initialized with zeroes, as real machines have random memory values at boot
*Focusing on the minute details in [[Z80]], [[CRTC ]] and [[8255|PPI ]] chips. They are most often wrong in emulators*Examining the [[FDC ]] chip. It is only replicated more or less superficially in all emulators because the internals of the chip are still unknown
Combining these methods will definitely get you a 100% success rate in detecting emulators, even the toughest ones.