08694: warfa and clones, sf2049 and clones: Game no longer starts.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08694	Crash/Freeze	Critical (emulation)	Always	Jul 2, 2023, 01:14	Jul 10, 2023, 04:42

Tester	Hydreigon	View Status	Public	Platform	MAME (Official Binary)
Assigned To	pmackinlay	Resolution	Fixed	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	midway/vegas.cpp
Version	0.256	Fixed in Version	0.257	Build	64-bit
		Fixed in Git Commit	4345485	Github Pull Request #

Summary	08694: warfa and clones, sf2049 and clones: Game no longer starts.
Description	Game fails to start up with either a black screen (warfa) or boot loop (sf2049) as of MAME 0.256. They worked fine in previous versions.
Steps To Reproduce	Start the game.
Additional Information
Github Commit

Flags
Regression Version	0.256
Affected Sets / Systems	warfa and clones, sf2049 and clones

Attached Files

No.21606 Osso Moderator Jul 2, 2023, 04:23	Works with -nodrc or by adding MIPS3DRC_EXTRA_INSTR_CHECK to the DRC options. Therefore my best guess of regression commit is https://git.redump.net/mame/commit/src/devices/cpu/mips?id=f3f10eef0f754f13b93787faa405f2180dff897a I'll let other more qualified people decide if it's better to add the extra check option in the driver or if something in the CPU core needs updating.
No.21608 Galenito Tester Jul 3, 2023, 22:30	Hey, I tried the -nodrc option with sf2049 in MAME 0.256, & nope, didn't fix it hope there's a patch for it soon.
No.21609 Osso Moderator Jul 4, 2023, 04:06	Sorry, I looked ad warfa. Let me see sf2049, may be a slightly different bug.
No.21610 Osso Moderator Jul 4, 2023, 04:56	Hmm, seems I somehow screwed up my testing, sorry. Neither warfa nor sf2049 are fixed with -nordc nor with the other method. Back to the drawing board.
No.21611 PepsiBoy428 Tester Jul 4, 2023, 13:19	I wonder, does sf2049se have this issue?
No.21613 Galenito Tester Jul 4, 2023, 23:21	I think the special edition has the loop bug