Slow day so i went on the lookout for Public Domain Roms(freeware) for the Atari 2600 and i found a total of 208 roms which can be used with any emulator that supports Atari 2600 emulation.

This adds to all these rom packs(all freeware/Public Domain too)

PC Engine Rom Pack 180 files

Genesis /Megadrive Rom Pack 52 files

Gameboy Mono / Colour Rom Pack 265 files

Wonderswan Rom Pack 13 files

NeoGeo Pocket Rom Pack 84 files

Nes Rom Pack 163 files

Nintendo 64 Rom Pack 117 games

Snes Rom Pack 184 games

Spectrum Rom Pack 100 games

Commodore 64 Rom Pack 48 games

Colecovision Rom Pack 62 files

Vectrex Rom Pack 103 files

Intellivision Rom Pack 20 files

Download all of these from This Page