By request, started to look at the Sega Model 2 HW. First thing, I’ve added a basic work-around for the network boards in Super GT 24h and Over Rev to boot in MAME. They needs inputs and presumably protection patches / simulations and/or gfx fixes:

Found the reason that kept The House of the Dead 2 / The Typing of the Dead to crash without any log, it was an int32 overflow bug in our renderer. Following are snaps actually taken from HOTD2 (that is known to have an earlier revision of the PowerVR, hence there are more video glitches than normal), since I’ve recently discovered that it boots fine in MAME, with the same protection check as Zombie Revenge / Dynamite Baseball.

(Following are The Typing of the Dead snaps)