hi
@Dobsa007
there are a few "enhanced" emulators but none (that i'm aware of) of them has FullHD or eZ80
(btw i think even 50MHz eZ80 would be way too slow for even for 720p with 8bit colour depth)
as mentioned above, the main problem is the lack of software and enough people willing to make it
so using eZ80 or incompatible video buffer arrangement seems pointless to me
add the risk of fragmenting the community even more
the older Spec256 concept used planar gfx for 8bit colour in the same 256x192 ZX$ window
ZX-Poly is 4bit but also has a mode for quad resolution in the same window instead (with colour clash)
for existing games both require the original gfx to be located and repainted manually but no coding skills
or you may check my own emulator
here ![Wink ;)](./images/smilies/icon_e_wink.gif)
as it's probably closer to what you're asking
it emulates a standard Spectrum connected to the peripheral device compatible with a generic Z80 based computer
aiming to provide full PAL resolution (the whole screen is accessible including the border area) with 15bit colour depth
but the main project goal was the easier and faster improvement of standard existing and future 128K ZX software
even though it requires some (dis)assembler knowledge it's more flexible and much faster than the Spec256 way
(the current number of improved modern and classic era games is about 150 right now)