08835: iganinju: Blackout on the Ranking Entry Screen

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08835	Graphics	Minor	Always	Mar 10, 2024, 15:45	Jun 30, 2024, 13:38

Tester	as-0229	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Reopened	OS	Windows 10/11 (64-bit)
Status [?]	Confirmed			Driver	jaleco/megasys1.cpp
Version	0.262	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08835: iganinju: Blackout on the Ranking Entry Screen
Description	After GAME OVER, screen TURNS BLACK OUT when it changes to the TOP 5 RANKING ENTRY screen. This problem only happens in Japanese version (IGA NINJUTSUDEN, not bootleg), don't happen in other versions.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	iganinju

Attached Files

No.22000 Haze Senior Tester Mar 11, 2024, 12:59	it writes 030c to active_layers_w the bootleg writes 000c it doesn't seem to be protection that I can tell but it does break the drawing in such cases, as the bits are used to decide layer ordering.
No.22007 Robbbert Senior Tester Mar 14, 2024, 14:39	After the continue screen finished, the Top 5 screen showed for me.
No.22022 Robbbert Senior Tester Mar 26, 2024, 13:00	Anyone able to confirm this?
No.22025 Haze Senior Tester Mar 26, 2024, 18:47	yes(?) it's a 100% reproduction rate
No.22027 Robbbert Senior Tester Mar 27, 2024, 23:13	Tried again, the top 5 screen showed up again - there's no issues. Since the problem shows for you, can you set the Status to Confirmed?
No.22028 Haze Senior Tester Mar 28, 2024, 00:13 edited on: Mar 28, 2024, 00:14	Did you get the high score before dying? If you get the high score, on the Japanese set, the initial entry screen is 100% black. The code flow seems unavoidable, the register write which changes the priority/enable determines this. The code on the bootleg is modified to avoid that write. I assume it's some quirk of the priority system that just happens to work on regular hardware, but didn't work on the bootleg hardware (which was likely closer to MAME's emulation) so they hacked it (or it's a bad dump because the world version doesn't do it) I'm assuming you're using unofficial builds, rather than one with some hacks in it which may change the behavior?
No.22033 Haze Senior Tester Mar 29, 2024, 12:38	it says ranking entry in the initial report, you don't get ranking entry (the chance to enter your name) unless you get a high score it was clear to me at least
No.22034 Haze Senior Tester Mar 29, 2024, 23:22	Robbbert> you've verified that it happens on hardware?
No.22036 Haze Senior Tester Mar 31, 2024, 04:47	@Robbbert does this happen on real hardware?
No.22078 Haze Senior Tester Apr 30, 2024, 21:05	since @Robbbert has failed to provide any evidence that this happens on real hardware I'm reopening this.
No.22200 as-0229 Tester Jun 30, 2024, 13:38 edited on: Jun 30, 2024, 13:40	Here's a link to the video of when this problem happens, You can watch it. https://drive.google.com/file/d/1k8MYPNsAJ-RSev35Cdz-GkvHD4qfLdmk/view?usp=drive_link This problem never happened when I played this game on a real hardware in the past.