08422: nes and clones, famicom and clones [opaopa]: Fantasy Zone II: HUD shows a line of garbage

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08422	Graphics	Minor	Always	Sep 25, 2022, 20:51	Sep 27, 2022, 20:44

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	nintendo/nes.cpp
Version	0.247	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08422: nes and clones, famicom and clones [opaopa]: Fantasy Zone II: HUD shows a line of garbage
Description	The bottom line of the in-game HUD shows garbage pixels that scroll along the main screen. Recordings of real hardware show that the garbage should be limited to a few pixels on the right and change constantly, as can be seen in the following videos: Interestingly, the area showing the garbage may differ slightly between NES/Famicom models (or when using flashcarts?).
Steps To Reproduce	Just start a game or wait for the demo to start.
Additional Information	This is also one of the NES games that show a noticeable colored border framing the screen, as reported here: https://mametesters.org/view.php?id=7054
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	nes and clones, famicom and clones [opaopa]

Attached Files	mame.png (16,254 bytes) Sep 25, 2022, 20:51 Uploaded by ICEknight MAME 0.247
	famicom.png (721,135 bytes) Sep 25, 2022, 20:52 Uploaded by ICEknight Famicom?
	nes flashcart.png (740,898 bytes) Sep 25, 2022, 20:52 Uploaded by ICEknight NES? with flashcart

No.20573 kmg Senior Tester Sep 26, 2022, 21:17	Another one of the many cartridge IRQ timers that don’t work well. I updated the Sunsoft-3 code previously, so it will take someone fixing the PPU. Still it’s good to know what the aberrations look like on real hardware. Side note: the other Sunsoft-3 game (mitokom) doesn’t use the IRQ as far as I could tell.
No.20574 ICEknight Tester Sep 27, 2022, 20:44 edited on: Sep 29, 2022, 17:09	Can confirm that the NES + flashcart combo indeed shows the effect as in the second video: The difference seen is likely caused by the flashcart's mapper emulation but, sadly, I don't have a real cartridge to confirm that it behaves as in the first video.