06930: robocop, robocopu, robocopw: The sound effect of the van's backdoor cuts off suddenly

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06930	Sound	Minor	Always	Apr 4, 2018, 01:49	28 days ago

Tester	StHiryu	View Status	Public	Platform	MAME (Unofficial Binary)
Assigned To		Resolution	Reopened	OS	Windows Vista/7/8 (64-bit)
Status [?]	Confirmed			Driver	dataeast/dec0.cpp
Version	0.196	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06930: robocop, robocopu, robocopw: The sound effect of the van's backdoor cuts off suddenly
Description	When you kill the driver of the final boss at stage 2, the backdoor opens and some enemies attack us. The sound of the backdoor when it's opening seems to cuts off.
Steps To Reproduce	Play until the final boss at stage 2 and wait until that door gets opened.
Additional Information	My recorded video in current mame 0.196: A video from world of longplays, surely played in a very old mame release, good sound effect: (Min 3:50) A video from an original Robocop PCB, good sound effect: (Min 12:27, barely audible): (removed private video)
Github Commit

Flags
Regression Version
Affected Sets / Systems	robocop, robocopu, robocopw

Attached Files

No.14915 wuemura Viewer Apr 4, 2018, 16:44	Robocop uses YM2203, this driver has sound issues.
No.14916 wuemura Viewer Apr 4, 2018, 19:24	Taking a closer look, this is similar to 6923, is hard to tell if the sound is playing or if the channel level is too low.
No.14917 StHiryu Tester Apr 4, 2018, 19:39	Well I don't think is played too low, really is likely the sound is different or corrupted. I think the sound is the same I've reported in 06166, when batman hits with the attack button.
No.14918 wuemura Viewer Apr 4, 2018, 20:11	I'm filling a report about the mame sound engine, maybe with that the developers could fix a issue that will benefit all this machines.
No.14985 StHiryu Tester Apr 25, 2018, 01:31 edited on: Apr 25, 2018, 14:41	Clearly related to 06740: Setting Overclock CPU: audio cpu to 150% solves the issue.
No.16337 StHiryu Tester Apr 16, 2019, 17:29	Taking a look to report 01066, maybe this issue is related to it?
No.18495 StHiryu Tester Feb 27, 2021, 17:37	Fixed in 95869d57181d6b6d38ec9511374c2c3e1de9f6cf
No.18498 Robbbert Senior Tester Feb 28, 2021, 11:56	Resolving at your word.
No.21017 Augusto Tester Jan 16, 2023, 05:00	That bug is happening again. Sound fx not being played. Ubuntu 20.04 MAME 0.251 64 bits.
No.21018 StHiryu Tester Jan 16, 2023, 14:18 edited on: Jan 17, 2023, 13:47	Confirmed at my side. This was fixed between 230 and 231, when Aaron made a lot of changes to the ymfm core. But at 231 the bug is still present so maybe a later ymfm commit could cause it...
No.21028 Augusto Tester Jan 20, 2023, 22:33	That issue need to be opened.
No.21029 Robbbert Senior Tester Jan 20, 2023, 22:40	Reopened at your word.
No.21030 Augusto Tester Jan 21, 2023, 05:58	Thanks. Have an nice week.
No.21054 Augusto Tester Jan 30, 2023, 10:24	When van backdoor open if overclocking the sound cpu in : - 105 to 109 % sound fx is Robocop jump. - 110 % bug is "fixed" .. sound fx is backdoor.
No.22384 hap Developer 28 days ago	Just like overclocking audiocpu 'fixes' it, underclocking maincpu also does. I see 68000 DTACK hooked up in the schematics, so I suspect it's that.