You are missing 22 of 7216 known Atari 2600 ROMS (V3.14)

Berzerk (Voice Enhanced) (Berzerk Hack) [a1]
Championship Soccer (AKA International Soccer) (1980) [p1][!]
Col-Gems Original (John Payson)
Conquest of Mars (John W. Champeau)
Crazy Valet (2000) (Hozer Video Games) [a1]
Cubis (SuperCharger) (1997) (Eckhard Stolberg)
Decathlon (1983) (HES) (PAL)
Ghost Manor (1983) (Xonox) (PAL) [a2][!]
Incoming (01-29-2002) (Ben Larson) (PD)
Pole Position (1983) (Atari) [a1][!]
Rocky & Bullwinkle (SuperCharger) (Prototype)
SCRPG 20060317 (SuperCharger)
SCTest (SuperCharger)
Sir Lancelot (1983) (Xonox) (PAL) [a1][!]
Spike's Peak (1983) (Xonox) (PAL) [a2][!]
Stampede (SuperCharger Conversion) (1981) (Activision) [t1]
Thrust (V0.01) (2000) (TJ)
Thrust (V1.11a) (2000) (TJ)
Thrust (V1.22) (2000) (TJ) [a1]
Thrust (V1.27) (2000) (TJ) [a1]
Thrust (V1.31) (2000) (TJ)
Ultra SCSIcide (Joe Grand) [a1]