well, my guess is as good as yours cos i never made an emu, but as nobody replyed till now, here goes a lot of manbo jambo that i invented as i was writing:
Pc works with hardware...so does the PSX.... what one has to do is criate a diversion to the pc so that he thinks he's a playstation....for this you need a bios... than you make a little program that send the bios to the memory....now you put a PSX cd in the cd rom drive...(he is almost convinced now) the final toutch is to make something that prevents him to check out it is a hoax... so you select a lot of plugins to keep him ocupied (that's why some games are so slow)...and now you have yourself a playstation.
As for the fact that some games work and others don't...well when the games don't work is because the pc found that he's not a playstation..so you have to wait that the software that emulates the psx can fool the pc better...got it?
ok, i only wrote this so that anyone that knows better come and give other options ( the real one would be nice)!

Pc works with hardware...so does the PSX.... what one has to do is criate a diversion to the pc so that he thinks he's a playstation....for this you need a bios... than you make a little program that send the bios to the memory....now you put a PSX cd in the cd rom drive...(he is almost convinced now) the final toutch is to make something that prevents him to check out it is a hoax... so you select a lot of plugins to keep him ocupied (that's why some games are so slow)...and now you have yourself a playstation.
As for the fact that some games work and others don't...well when the games don't work is because the pc found that he's not a playstation..so you have to wait that the software that emulates the psx can fool the pc better...got it?
ok, i only wrote this so that anyone that knows better come and give other options ( the real one would be nice)!