Quick search provided this link which seems to have all the info you need.
>if i dump bios on my computer will ps2/ps1 work?
Yes and no.
The emulators will fuction properly if you have hte BIOS for the respecive consoles, however PCSX2 basicaly doesn't play any games at the moment
ePSXe (and othe PSX emulators) don't use the PS2 BIOS. They need the PSX BIOS to work.