07364: USA sets in aristmk5.cpp: Video troubles after changing System Configuration.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07364	Graphics	Major	Sometimes	Jun 20, 2019, 18:04	Jul 14, 2022, 20:41

Tester	Roberto Fresca	View Status	Public	Platform	MAME (Self-compiled)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Acknowledged			Driver	acorn/aristmk5.cpp
Version	0.210	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07364: USA sets in aristmk5.cpp: Video troubles after changing System Configuration.
Description	After changing System Configuration, the video is severe damaged. Need to exit and run again to get the proper thing. And also there is an eventually crash at the begining too.
Steps To Reproduce	1) Run an USA set (I tested it with Cuckoou). 2) Press TAB to enter the menu... 3) Go to MACHINE CONFIGURATION, and choose different Set Chips. Go to RESET. 4) Sometimes you can see the bug as seen in the attached snaps.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	USA sets in aristmk5.cpp

Attached Files	aristmk5_setchip_change_error_01.png (13,026 bytes) Jun 20, 2019, 18:04 Uploaded by Roberto Fresca
Attached Files	aristmk5_setchip_change_error_02.png (25,382 bytes) Jun 20, 2019, 18:04 Uploaded by Roberto Fresca

No.16580 Tafoid Administrator Jun 21, 2019, 17:55	Not sure if this is expected behavior or not. That particular machine is flagged MNW - very few machines in the driver are not flagged. Perhaps you can try another machine that isn't flagged and confirm it with that?
No.16583 Roberto Fresca Developer Jun 22, 2019, 15:01	Nope. All USA sets (that allow the set chips) are flagged as not working. But are flagged due to speed issues.
No.20383 Heihachi_73 Tester Jul 14, 2022, 20:41	A similar glitch happens, or used to happen (last time I checked was either 0.209 or 0.214), when using MAME's internal menu (e.g. MEWUI) when exiting a game and playing another aristmk5 game immediately after. Occasionally MAME would simply exit (crash on load) rather than showing a corrupted screen. Never happened in the command line or as a shortcut/batch file though. This is unrelated to the MNW flag. The only reason the US sets are flagged MNW is because the coin input is buggy and randomly gives a Coin Diverter Error which you have to clear by opening and closing the main door (note that the games continue to accept coins even after the error or when the door is open, on a real machine the coins would fall straight through to the tray if the machine was in error/door open mode - naturally, that's the job of the coin diverter). Technically, the vast majority of US games are just as "working" as the other non-flagged sets as they don't hang after X spins, but the coin input lets them down. The only US games, all 18 of them, which are genuinely MNW are those noted near the top of the driver (excluding bad dumps). AFAIK the speed/timing issue is due to an unemulated interlace mode, which is forcing the games to drop every second frame (the sample playback is seemingly tied to vblank too, which is why everything sounds twice as fast - not in pitch, but speed), which is not related to the games hanging. As for why the sound buffer is completely fubar on certain games, I have absolutely no idea.