sxevious keeps booting up over and over again

[phqmourao]

MAME version

0.266

System information

Windows 11

INI configuration details

No response

Emulated system/software

No response

Incorrect behaviour

The game Super Xevious (sxevious) restarts instants after reaching the title screen.

Expected behaviour

After booting up, the game should remain on the title screen.

Steps to reproduce

No response

Additional details

No response

[Osso13]

Confirmed, regression version seems to be 0.254

Suspect commit: https://git.redump.net/mame/commit/?id=c0b57d30f0ce39c445190fe4e27bec6c57ebb137

[angelosa]

Reset isn't caused by watchdog, but rather an intentional snippet where it expects:

3C80: cp   $95 ; from $8063 RAM buffer
3C82: jp   nz,$0000
0000: ld   a,$10
0002: ld   ($7100),a

Game eventually boots anyway (at least by speeding emu up here), but somehow this is 0x05 the first time around.