But even though the Spectrum emulator is literally excellent, the Zeddy emu is not THAT good, at least as one would expect...
It has more or less the same compatibility issues that I found when running your Zeddy emu under Spectrum emulation...
Anyway, thumbs up to the author, as it is a really good piece of software, despite its imperfections and we shouldn't forget that it's 10 years old, without further improvement...
The benefits are a little more speed (as it runs "natively" on the EP) and the very nice feature of directly loading .P files!!
I just read the article, it is a copy of my emulator from 1997. I am honoured.