07332: zigzagb, zigzagb2: Game will hang when you play a 2 player game

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07332	Gameplay	Critical (emulation)	Always	May 20, 2019, 19:52	May 22, 2019, 13:14

Tester	-Misc Reporters-	View Status	Public	Platform	MAME (Official Binary)
Assigned To	AJR	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	galaxian/galaxian.cpp
Version	0.209	Fixed in Version	0.210	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07332: zigzagb, zigzagb2: Game will hang when you play a 2 player game
Description	When you play a two player game, when the 2nd player has died for the first time and the 1st player takes over again, there is screen corruption. When the 1st player dies again, there is some sort of crazy screen corruption which happens and the game essentially is unplayable until reset/restarted.
Steps To Reproduce	- Start either machine - credit 2 times, start 2 player game - Start player 1 and die - Start player 2 and die - observe graphical corruption - player 1 dies, the game becomes unusable
Additional Information	First reported here: https://forum.mamedev.org/viewtopic.php?f=14&t=423 Regression traced initially to the great galaxian rewrite which happened on 0.124u1. At that time, game would end after 3 total deaths in a 2 player game(watchdog?). https://github.com/mamedev/mame/commit/6979179c11d3038a63726fa011e5b2b23df16c7a Then, as mentioned in 02817, with 0.128u4 the games were constantly rebooting. Quite possibly, this is due to major CPU memory addressing changes, but unconfirmed. This was fixed in 0.128u6, game plays seemingly normal as a 1 player game, but the issue shows up in a 2 player game as reported. https://github.com/mamedev/mame/commit/2667ca65f1bf115f95b490e35cc74c96dd6f4101
Github Commit

Flags
Regression Version	0.124u1,0.128u4,u6
Affected Sets / Systems	zigzagb, zigzagb2

Attached Files