On the PS1, Final Fantasy VII was O=yes, X=no, and so were a bunch of the less mainstream JRPGS; also, Metal Gear Solid games were O=yes, X=no at least into the PS2 era.
I actually distinctly remember getting a copy of Metal Gear Solid 2 and being confused why I couldn't start the game. Hitting any button on the splash screen would take you to the menu, and then hitting X from there would take you back to the splash screen. Having primarily played western games up to that point, it didn't even occur to me that another button could be used for 'confirm'.