05373: capbowl3, capbowl4: Black screen after starting game

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05373	Crash/Freeze	Critical (emulation)	Always	Nov 18, 2013, 21:46	Nov 19, 2013, 14:03

Tester	scoobydude51	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Phil Bennett	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	itech/capbowl.cpp
Version	0.151	Fixed in Version	0.152	Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	05373: capbowl3, capbowl4: Black screen after starting game
Description	I got a black screen after starting the game. I hear the startup tone but I don't get the "System Status OK" message and stays black.
Steps To Reproduce
Additional Information	strangely, capbowl and capbowl2 works fine. I saw the message and the games starts. NOTE: I deleted everything and I still got the black screen.
Github Commit

Flags
Regression Version
Affected Sets / Systems	capbowl3, capbowl4

Attached Files

No.10002 Tafoid Administrator Nov 18, 2013, 23:33	It seems to happen on the second boot and later after it exits the first time and writes nvram. Not reading (or writing) the nvram correctly?
No.10004 NekoEd Senior Tester Nov 18, 2013, 23:50	Sounds like it's writing garbage to the NVRAM on the first boot then crashing on it when it reads it in subsequent boots. Regression?
No.10006 Phil Bennett Developer Nov 19, 2013, 14:03	For whatever reason, these two sets use the watchdog timer to delay the boot process. They wait for five resets before executing the startup code. The watchdog wasn't enabled by default so they'd never get reset. According to the driver there are schematics available but I couldn't find them so I guessed the watchdog period (8 V-BLANKs).