09430: rthunder0: Watchdog bites and game resets itself

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09430	Crash/Freeze	Major	Always	18 hours ago	2 hours ago

Tester	Robbbert	View Status	Public	Platform	MAME (Self-compiled)
Assigned To	hap	Resolution	Fixed	OS	Windows (x64)
Status [?]	Resolved			Driver	namco/namcos86.cpp
Version	0.287	Fixed in Version	0.288GIT	Build	x64
		Fixed in Git Commit	c854d75	Github Pull Request #

Summary	09430: rthunder0: Watchdog bites and game resets itself
Description	Game is listed as working. In the attract mode, after the first fight, a computer screen shows. A laughing alien should appear, along with some workers, but nothing happens. Then there's a shot sound and the game resets. The other sets don't have this problem.
Steps To Reproduce	>mame rthunder0 Wait while the attract mode plays, and the player dies. Then the computer shows. After a while the game resets. The error log shows masses of random writes, followed by the watchdog.
Additional Information
Github Commit

Flags
Regression Version	0.254
Affected Sets / Systems	rthunder0

Attached Files

No.24305 Robbbert Moderator 5 hours ago	Thanks, it runs fine now.
No.24307 hap Developer 2 hours ago	I think it regressed here, but the commit doesn't look wrong, just unlucky CPU timing I guess. https://github.com/mamedev/mame/commit/9dc9d774c0c5714d66677687f17c0ca3f0206094 Annoyingly, tweaking the quantum to a random higher value will cause similar reset bugs in rthunder1 and wndrmomo. So it needs to be even tighter.