01467: galaga, galagao, galagamk, gallag: Watchdog Reset causing game to hang.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
01467	Crash/Freeze	Critical (emulation)	Always	Mar 7, 2008, 23:36	Mar 13, 2008, 18:04

Tester	Tafoid	View Status	Public	Platform	MAME (Self-compiled)
Assigned To	zsoltvasvari	Resolution	Fixed	OS	Windows 2000
Status [?]	Resolved			Driver	namco/galaga.cpp
Version	0.123u4	Fixed in Version	0.123u5	Build
		Fixed in Git Commit		Github Pull Request #

Summary	01467: galaga, galagao, galagamk, gallag: Watchdog Reset causing game to hang.
Description	Starting any of the sets above brings about the pop-up message: Reset caused by the watchdog!!! It appears to restart reboot and then hangs at an upside down screen. Only those sets seem to be effected. All other galaga clones and all other sets in the galaga.c do not seem effected upon bootup.
Steps To Reproduce	Start game, allow game to go through boot sequence - watchdog will kick in towards the end and the cycle begins again - then a frozen screen "RAM OK" shows upside down.
Additional Information
Github Commit

Flags
Regression Version	0.123u4
Affected Sets / Systems	galaga, galagao, galagamk, gallag

Attached Files	0000.png (462 bytes) Mar 7, 2008, 23:36

No.00066 couriersud Developer Mar 7, 2008, 23:50	in mame/drivers/galaga.c the following will fix it ------------------------------------------- ... #include "nam_cust.h" static int ilcnt = 0; static INTERRUPT_GEN( galaga_cpu3_nmi ) { /* see notes at the top of the driver */ //if (cpu_getiloops() & 1) ilcnt++; if (ilcnt & 1) nmi_line_pulse(machine, cpunum); } ------------------------------------------- However, this is as bad a hack as the "cpu_getiloops". I just do not have time to provide a better solution before end of march. Left as a todo here.
No.00067 couriersud Developer Mar 7, 2008, 23:52	Confirmed.
No.00069 zsoltvasvari Developer Mar 8, 2008, 02:48	That above fix is just fixing the existing hack. The correct fix is to generete the interrupts on the right scanline. This has been done for the next U release.