I tried to make a summary of the games that work with play 0.71_13, so as to have something tangible for everyone, if there are errors, report it, so I can update the post:
List of Namco System 246 games:
OK Battle Gear 3 Ver. 2.01A (Taito, 2002)
OK Battle Gear 3 Ver. 2.07J (Taito, 2002)
OK Battle Gear 3 Ver. 2.08J (Taito, 2002)
OK Battle Gear 3 Tuned Ver. 2.05J (Taito, 2003)
OK Bloody Roar 3 (Namco / 8ing / Raizing, 2000)
OK Capcom Fighting Jam (Capcom, 2004)
OK Cobra: The Arcade (Namco, 2004)
OK Cobra: The Arcade [World] (Namco, 2004)
NO Dragon Chronicles (Namco, 2002)
NO Dragon Chronicles Online
OK Fate/Unlimited Codes (Capcom / Type-Moon / Cavia / 8ing, 2008)
OK Fate/Unlimited Codes [Bootleg] (Capcom / Type-Moon / Cavia / 8ing, 2008)
OK Mobile Suit Gundam SEED: Federation Vs. Z.A.F.T. (Capcom / Banpresto, 2005)
OK Mobile Suit Gundam SEED Destiny: Federation Vs. Z.A.F.T. II (Banpresto, 2006)
OK Mobile Suit Gundam Z: AEUG Vs. Titans (Capcom / Banpresto, 2003)
OK Mobile Suit Gundam Z: AEUG Vs. Titans DX (Capcom / Banpresto, 2004)
OK-5 Minnade Kitaeru Zennou Training (Namco, 2006)
OK-4 Netchuu Pro Yakyuu 2002 Ver. C (Namco, 2002)
OK-4 Netchuu Pro Yakyuu 2002 Ver. B (Namco, 2002)
OK Pride GP 2003 (Capcom, 2003)
OK Quiz and Variety Sukusuku Inufuku 2 (Namco / AMI / Hamster, 2007)
OK Quiz Mobile Suit Gundam: Tou. Senshi (Banpresto, 2006)
OK-1 Ridge Racer V: Arcade Battle [RR3 Ver. A] (Namco, 2000)
NO Ridge Racer V: Arcade Battle [RR1 Ver. A] (Namco, 2000)
NO Ridge Racer V: Arcade Battle [RR2 Ver. A] (Namco, 2000)
OK Sengoku Basara X Cross (Capcom / ARC System Works, 2008)
OK-2 Smash Court Pro Tournament (Namco, 2001)
OK Soul Calibur II (Namco, 2002)
OK Soul Calibur II Ver.B (Namco, 2002)
OK Soul Calibur II Ver.D (Namco, 2003)
OK Soul Calibur III Arcade Edition Ver.A (Namco, 2006)
OK Soul Calibur III Arcade Edition Ver.B (Namco, 2006)
OK Taiko No Tatsujin 7 (Namco, 2005)
OK Taiko No Tatsujin 8 (Namco, 2006)
NO Technic Beat (Arika, 2002)
OK Tekken 4 [TEF1 Ver. A] (Namco, 2001)
OK Tekken 4 [TEF2 Ver. A] (Namco, 2001)
OK Tekken 4 [TEF2 Ver. C] (Namco, 2001)
OK Tekken 4 [TEF3 Ver. C] (Namco, 2001)
OK Time Crisis 3 (Namco, 2002)
OK Time Crisis 3 TST2 Ver. A (Namco, 2002)
OK Time Crisis 3 TST3 Ver. A (Namco, 2002)
OK Vampire Night (Namco / Sega / WOW Entertainment, 2000)
OK Wangan Midnight (Namco, 2001)
OK Wangan Midnight R (Namco, 2002)
OK Zoids Infinity (Taito, 2004)
List of Namco System 256 Games:
OK Ace Driver 3 Final Turn (Namco, 2008)
OK Chou Dragon Ball Z (Banpresto, 2005)
NO Druaga Online - The Story of Aon (Namco, 2005)
OK Kinnikuman Muscle Grand Prix (Banpresto, 2006)
OK Kinnikuman Muscle Grand Prix 2 (Banpresto, 2007)
OK Mobile Suit Gundam: Gundam Vs. Gundam (Banpresto, 2008)
OK Mobile Suit Gundam: Gundam Vs. Gundam Next (Banpresto, 2009)
OK Moto GP (Namco, 2007)
OK Sengoku Basara X Cross (Capcom / ARC System Works, 2008)
OK Taiko No Tatsujin 9 (Namco, 2006)
OK Taiko No Tatsujin 10 (Namco, 2007)
OK Taiko No Tatsujin 11 (Namco, 2008)
OK-6 Taiko No Tatsujin 11 More (Namco, 2009)
OK Taiko No Tatsujin 12 (Namco, 2008)
OK-6 Taiko No Tatsujin 12 More (Namco, 2009)
OK Taiko No Tatsujin 13 (Namco, 2009)
OK Taiko No Tatsujin 14 (Namco, 2010)
OK Tekken 5 (Namco, 2004)
OK Tekken 5.1 (Namco, 2005)
OK Tekken 5 Dark Resurrection (Namco, 2005)
NO The Battle of YuYu Hakusho (Banpresto, 2006)
OK-7 THE iDOLM@STER Station (Namco, 2005)
OK-8 THE iDOLM@STER Tower (Namco, 2005)
OK Zoids Infinity EX Plus (Taito, 2006)
List of System Super 256 Games:
OK Time Crisis 4 [Japan, TSF1001-NA-A] (Namco, 2006)
OK Time Crisis 4 [World, TSF1002-NA-A] (Namco, 2006)
List of System 147 Games:
OK Pac-Man's Arcade Party (Namco Bandai 2010)
OK Pac-Man Battle Royale (Namco Bandai 2010)
List of System 148 Games:
OK-9 Umimonogatari Lucky Marine Theater (Namco Bandai 2010)
Notes:
OK-1 (no buttons work)
OK-2 (nothing happens after the player's selection)
OK-4 (stucks on "Checking System")
OK-5 (stucks on the initial stage)
OK-6 (stucks on "System Error")
OK-7 (stucks on "CARD R/W SHUTTER ERROR")
OK-8 (cannot start game - only demo loop)
OK-9 (stucks on "Ruler PCB Disconnect")