07602: raiden2, raidendx, raiden: No collision on top edge of gameplay area

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07602	Gameplay	Major	Always	Mar 31, 2020, 20:58	Apr 4, 2020, 04:00

Tester	Kale	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Bugs That Aren't Bugs	OS	Windows 10 (64-bit)
Status [?]	Resolved			Driver	seibu/raiden2.cpp
Version	0.219	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07602: raiden2, raidendx, raiden: No collision on top edge of gameplay area
Description	Try to hit something in Raiden II or DX when the hitbox is on the top 16 "rows" (basically behind the score layer) causes no collision detection. This is particularly obvious for fixed pattern enemies like tanks or power-up ship.
Steps To Reproduce	Play the attached example file. Snapshots refers to where the hit occurs normally and don't on slightly different "Y" positions.
Additional Information	Both games shares the same sprite DMA protection handlers. Doesn't occur on PS1 ports fwiw
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	raiden2, raidendx, raiden

Attached Files	0051.png (24,880 bytes) Mar 31, 2020, 20:58 Uploaded by Kale nohit
	0052.png (25,649 bytes) Mar 31, 2020, 20:58 Uploaded by Kale hit
	raidendx_example_bug.zip (10,337 bytes) Mar 31, 2020, 20:59 Uploaded by Kale inp made with 0.219

No.17522 Fujix Administrator Apr 2, 2020, 05:10 edited on: Apr 2, 2020, 05:22	Yes, confirmed the issue. Here's capture of the real arcade (A Shooter festival held at Mikado Arcade). And I have heared they were saying it is intentional. You can check that the player can't shoot the mid-size ship in Also here, the ground enemies have no collision detection:
No.17525 Fujix Administrator Apr 4, 2020, 04:00	This is where they are explaining about the top "safety zone", enemies don't have collision detection when they are in the top 2-char height, and it is refined "Kyukyoku Tiger".