02640: kazan, iganinju: Multiple issues (slow graphic rendering, missing graphics)

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
02640	Gameplay	Major	Have not tried	Nov 10, 2008, 02:13	Jan 4, 2016, 21:45

Tester	Tafoid	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Kale	Resolution	Fixed	OS	Windows 2000
Status [?]	Resolved			Driver	jaleco/megasys1.cpp
Version	0.128u3	Fixed in Version	0.170	Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	02640: kazan, iganinju: Multiple issues (slow graphic rendering, missing graphics)
Description	From 0.127u1 - there was some change (I suspect 68000 core related) which caused the speed of the action in the game to slow to at least 1/5th the speed of normal gameplay (use 0.127 to compare). MAME 0.127u6 introduced another issue, which renders the game completely unplayable due to lack of displayed graphics (you cannot see anything but a yellow screen.) Throughout all the issues, the sound is played at normal speed as well as inputs working as expected.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version	0.127u1, 0.127u6
Affected Sets / Systems	kazan, iganinju

Attached Files

No.03024 Mamesick Senior Tester Nov 11, 2008, 06:07	Patching out from the interrupts routine the level3 IRQ makes the graphics appear again. The game remains very very slow though so my guess is that kazan need its own interrupt routine that is probably different from the other games.
No.03025 Haze Senior Tester Nov 11, 2008, 12:44	more likely the interrupts just need fixing in the driver, just look at all the other problems (terrible sprite lag in avenging spirit for example) I guess it's possible the protection device is involved, but, yeah, interrupts in the driver are a mess, and the sources aren't known.
No.07587 haynor666 Tester Jun 29, 2011, 07:48	Should be marked as non working?
No.07625 Kale Developer Jul 2, 2011, 17:13	No, it was somehow working before. I'm planning into rewriting the whole irq stuff for the driver, and try to understand how the protection basically works in it rather than just do patches.