Atari 2600 Roms

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Obelix (1983) (Atari) 6 kb
Obelix (1983) (Atari) (NTSC by Thomas Jentzsch) 6 kb
Obelix (1983) (Atari) (PAL) [!] 6 kb
Ocean City Defender (Zellers) 4 kb
Octopus (AKA Name That Game) (Carrere Video) (PAL) [!] 4 kb
Off the Wall (1989) (Atari) (PAL) [!] 9 kb
Off the Wall (1989) (Atari) (PAL) [b1] 8 kb
Off the Wall (1989) (Atari) (PAL) [o1] 9 kb
Off Your Rocker (1983) (Amiga) 4 kb
Oink! (1983) (Activision) (PAL) [!] 5 kb
Oink! (1983) (Activision) (PAL) [p1][!] 4 kb
Oink! (1983) (Activision) [!] 5 kb
Oink! (1983) (Activision) [o1] 5 kb
Oink! (CCE) 4 kb
Okie Dokie (4K) (PD) 4 kb
Okie Dokie (Older) (PD) 3 kb
Okie Dokie (PD) 3 kb
Omega Race (1983) (CBS Electronics) 7 kb
Omega Race (1983) (CBS Electronics) [o1] 7 kb
One Blue Bar Demo (PD) 1 kb
Oscar's Trash Race (1983) (Atari) (PAL) [!] 7 kb
Oscar's Trash Race (1983) (Atari) (Prototype) (PAL) 7 kb
Othello (1978) (Atari) 3 kb
Othello (1978) (Atari) (PAL) [!] 3 kb
Othello (1978) (Atari) (PAL) [p1][o1][!] 3 kb
Othello (1978) [p1] 3 kb
Othello (1978) [p1][o1] 3 kb
Othello (32-in-1) (Atari) (PAL) [!] 3 kb
Out of Control (1983) (Avalon Hill) 4 kb
Outlaw (32-in-1) (Atari) (PAL) [!] 3 kb
Outlaw - GunSlinger (1978) (Atari) 3 kb
Outlaw - GunSlinger (1978) (Atari) (PAL) [!] 3 kb
Outlaw - GunSlinger (1978) (Atari) [o1] 3 kb
Overhead Adventure Demo 1 (PD) 2 kb
Overhead Adventure Demo 2 (PD) 2 kb
Overhead Adventure Demo 3 (PD) 2 kb
Overhead Adventure Demo 4 (PD) 2 kb
Overhead Adventure Demo 5 (PD) 2 kb
Overhead Adventure Demo 6 (PD) 2 kb
Oystron (V2.7) (PD) 4 kb
Oystron (V2.8) (PD) 4 kb
Oystron (V2.82) (PD) 4 kb
Oystron (V2.85) (PD) 4 kb
Oystron (V2.9) (PD) 4 kb
Oystron X 4 kb