Quote:
Originally Posted by jotd
It seems stupid, but emulation takes a lot of CPU power. The CPU itself isn't the bigger problem. Video refresh, on the other hand, costs a lot. You have to emulate the CPU but also the speccy video chip, and refresh it at a reasonable rate, when the speccy video chip can do 50 or 60 Hz.
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And on the Spectrum cycle accurate CPU emulation is also crucial, as a lot of tricks (at least in demos) are done purely with CPU timing.