06270: danchih, danchiq: Both games freeze under certain circumstances

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06270	Crash/Freeze	Critical (emulation)	Always	Jul 2, 2016, 17:35	Sep 8, 2016, 18:12

Tester	izius	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows XP
Status [?]	Confirmed			Driver	sega/stv.cpp
Version	0.175	Fixed in Version		Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	06270: danchih, danchiq: Both games freeze under certain circumstances
Description	These games freeze right after doing specific actions. In every case I've seen, the freeze is triggered when a voice sample is playing, causing it to get looped, while the BGM continues playing as normal. I don't know if that's a cause or an effect. More info below.
Steps To Reproduce	Just watch the attract mode. Both games will freeze at the title screen on the 2nd loop (danchih) or the 3rd (danchiq). For some in-game specific freeze, A) in danchih: 1) simply insert a coin (random, depends on which voice speaks out the game title); 2) call a koi-koi (get a winning card combination, then choose yes); 3) don't call a koi-koi (same as 2), but choose no); 4) have the opponent get a koi-koi against you; 5) lose a round, depleting your points and getting to the continue screen; 6) after winning a round, lose one without depleting all your points, to get a small speech from your opponent. Points 2-6 work only on specific opponents; for example, 2 and 6 on oppo A, 3 and 4 on oppo B. B) in danchiq: 1) simply insert a coin (random, depends on which voice speaks out the game title); 2) give a right answer against some specific opponents (the 2nd in stage 1, choice 1 and the 1st in stage 3, choice 1); 3) defeat opponent in stage 2 and get to her cutscene; 4) after defeating the opponent in stage 3, choice 2. Possibly more for both games.
Additional Information	I've tested these 2 games because they're from the same company. Possibly other games could be affected. For danchiq, I used -cheat to advance ('Display the correct answer', which shouldn't affect the game). Tested without cheats as well, the title screen and the insert coin freeze both occur anyway.
Github Commit

Flags
Regression Version	0.148u1
Affected Sets / Systems	danchih, danchiq

Attached Files

No.12875 B2K24 Senior Tester Jul 2, 2016, 19:05	An easier way to repo the reported looped behavior for danchin is - insert one credit at the warning screen. Then wait a few seconds and let attract advance to title screen inserting credit two and soon as you hear the female voice. You'll get the looping/freeze effect every time.
No.13118 Kale Developer Sep 6, 2016, 09:42	Have you tested with non-DRC?
No.13131 izius Tester Sep 8, 2016, 18:12	No, I didn't know that option could be useful here. I wasn't even aware it existed... Tested now with -nodrc in the current version (0.177). Both games are noticeably slower, but aside of that they behave the same, locking up in the various instances reported.