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ECM said:
System 146 is also a PS2-derived board, and comes before 246 in the numbering scheme (used in Pac-Man Battle Royale, for one), but post-dates the ones you mentioned.

You also left out the PS1-derived NAMCO arcade boards: System 11 and 12.

/anal completist

I was going to post exactly this. It's the reason why almost all Namco games were Sony exclusives in the 5th gen.