09197: All Tarzan and Starzan set: The graphics show characters crammed onto the screen

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09197	Graphics	Major	Random	13 days ago	9 days ago

Tester	mdqgames	View Status	Public	Platform	MAME (Self-compiled)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Confirmed			Driver	igs/igs017.cpp
Version	0.278	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	09197: All Tarzan and Starzan set: The graphics show characters crammed onto the screen
Description	After several rounds, when pressing the Take key, several characters begin to multiply on the game screen, completely polluting the screen.
Steps To Reproduce	Just put credits in and play at max bet until the problem occurs. It usually occurs when you press the Take button, and at max bet, I have the impression that you get to the problem more quickly.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	All Tarzan and Starzan set

Attached Files	512779471_1434554941080744_8296472493616416633_n.jpg (222,331 bytes) 13 days ago Uploaded by mdqgames
Attached Files	514317485_1124484759507049_5812881364291750730_n.jpg (225,439 bytes) 13 days ago Uploaded by mdqgames imagem extra

No.23430 Osso Moderator 12 days ago	Did this happen in older versions, too, or only starting with 0.278?
No.23434 Robbbert Moderator 12 days ago	Tried starzan and jking200pr, unable to reproduce this problem.
No.23439 mdqgames Tester 12 days ago	. Yes, it happened in previous versions. To reproduce the problem you need to play for some time, it seems that playing with a completely full total bet makes the problem appear more quickly. After the trash appears on the screen, if you change the layout, whether to OddsTable, configuration... when you return to the main layout the trash disappears, but reappears again in the next plays.
No.23440 cuavas Administrator 12 days ago	I had this happen with tarzan months ago when I was mucking around fixing inputs.
No.23441 mdqgames Tester 12 days ago	The game is switching between different areas of the sprite ROM, waiting for each one to be descrambled separately. But MAME only calls tarzan_decrypt_sprites() once, at boot. Maybe the solution is to detect when the sprite pool changes (probably by some write to protected registers) and call it again. This is just an opinion that may not be well founded.
No.23453 Haze Senior Tester 9 days ago	This 'random sprites' things on IGS games is usually a protection failure. Some of the PGM games will do the same in the case of protection fails (or a build-up of protection fails that happen over time)