Someone told me in the impact forums that the coding could be
done in a day, and besides alot of things impact emu has left uncovered, since the
audio is near perfect in psx emulation, impact sound would be too, and gfx, are
perfect in psx emulation, so it all depends on the machine you got.
Someone told shit then... you not only have to handle a bigger ram size with a ZN emu, you also have to figure out the rom banking... not likely done in one day...
for the gfx and spu:
the impact games are needing more gpu vram as well and the dma chains can be located in higher psx ram adresses, so you have to change a lot of funcs in a current psx gpu plugins... not to mention to adjust the texture caching to handle the double amount of textures...
and NO psx spu plugin has ever needed to decode QSound data (which needs an extra Z80 emu inside of the plugin to work anyway)
Well, it can be done (look at impact), but it's not like "hey, gimme a psx emu source, and I will make a ZN emu in a week or two..."