Someone mentioned the C64?
Sinclair ZX Spectrum 48k > C64, ataris, amstrad, nes and megadrive.
Someone post a link to a working PS2 emulator please, I look every few months but I haven't found a working one yet.
And this is stretching my memory a bit, but I seem to remember from discussion on the old (now sadly defunct) gta3forums.com boards that the code for the PS2 and PC are very similar. I think that people found mentions of multiplayer in the PS2 version even before the PC version was released. So I think online PS2 play is possible, though perhaps not any time soon.