actually, the ps3 has 3 ps2 emulator files. ps2_netemu is for ps2 classics and for non-bc systems. the other two are for full bc (ps2_emu) and semi-bc (ps2_gxemu). ps2_netemu was ps2_softemu before, and it's how a lot of those config files were found since it's a treasure trove of them. I'm not sure when they switched to netemu though. it was softemu on 3.55 and possibly later. this emulator was even in as far back as 2.76 (decrypted on my computer). I tried it on 3.55 with cobra, and it was pretty unstable as it was incomplete. I think sony was looking for an all software bc. then, they came up with netemu and forced you to pay for limited bc.