I can think of some possible ways to get gta on mac.
1-Gta and gta2 on ps1 emulator
2-gta advance on gba emulator
3-old gta gamboy/gamboy color version in gameboy color emulator
4-I dont think theres a ps2 or xbox emulator for mac and pc emulators cant run games. But maybe there will be one soon(when the ps3 comes out)
This place has some good emulators http://www.emulator-zone.com/doc.php/mac/
1-Gta and gta2 on ps1 emulator
2-gta advance on gba emulator
3-old gta gamboy/gamboy color version in gameboy color emulator
4-I dont think theres a ps2 or xbox emulator for mac and pc emulators cant run games. But maybe there will be one soon(when the ps3 comes out)
This place has some good emulators http://www.emulator-zone.com/doc.php/mac/