Well as I mentioned, Starblade and Prop Cycle is working pretty good right now. Below is a list of System 21 and System 22 games that I assume will work sometime soon.
Air Combat (Japan)
Air Combat (US)
Cyber Sled (Japan)
Cyber Sled (US)
Driver's Eyes
Solvalou (Japan)
Starblade
Winning Run 91
Winning Run Suzuka Grand Prix
Ace Driver (Rev. AD2, World)
Ace Driver: Victory Lap (Rev. ADV2, World)
Air Combat 22 (Rev. ACS1 Ver.B)
Alpine Racer (Rev. AR2 Ver.C)
Alpine Racer (Rev. AR2 Ver.D)
Alpine Racer 2 (Rev. ARS2 Ver.B)
Alpine Surfer (Rev. AF2 Ver.A)
Cyber Commando (Rev. CY1, Japan)
Cyber Cycles (Rev. CB2 Ver.C)
Prop Cycle (Rev PR2 Ver.A)
Rave Racer (Rev. RV1 Ver.B, Japan)
Rave Racer (Rev. RV1, Japan)
Rave Racer (Rev. RV2, World)
Ridge Racer (Rev. RR1, Japan)
Ridge Racer (Rev. RR2, World)
Ridge Racer 2 (Rev. RRS1, Japan)
Ridge Racer 2 (Rev. RRS1, Ver.B, Japan)
Ridge Racer 2 (Rev. RRS2, US)
Time Crisis (Rev. TS2 Ver.A)
Time Crisis (Rev. TS2 Ver.B)