06036: nes [castlenu, cobrart, guardlgn, immortal, romancia]: Buzz/Static in audio

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06036	Sound	Minor	Always	Oct 8, 2015, 00:23	Sep 30, 2022, 07:17

Tester	Tafoid	View Status	Public	Platform
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	nintendo/nes.cpp
Version	0.166	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	06036: nes [castlenu, cobrart, guardlgn, immortal, romancia]: Buzz/Static in audio
Description	There is regression in NES over time which I've isolated some softlist items which are now exhibiting a buzz/noise/static in the audio output. This is shown either directly at title, or after start/during play. In some limited testing, I have a list of ones I've found to be updated as more are found: castelnu, kyorolnd cobratr, cobratru guardlgn, guardlgnu immortal romancia
Steps To Reproduce
Additional Information	Tested confirmed regression between 0.102 and 0.103 release. There were a major change with APU which would probably be the first place to check Switched to use the MAME NES APU implementation. [R. Belmont]
Github Commit

Flags
Regression Version	0.103
Affected Sets / Systems	nes [castlenu, cobrart, guardlgn, immortal, romancia]

Attached Files

No.12057 B2K24 Senior Tester Oct 9, 2015, 14:20	I've heard similar and always just assumed it was something on my end.
No.19796 kmg Senior Tester Feb 18, 2022, 21:56 edited on: Feb 18, 2022, 22:10	The buzz issue seems to have been mostly fixed in https://github.com/mamedev/mame/commit/1f99365bbd49bedcb9bcfaef15b4cba7a6dbdd63 by cam900. The one exception that I can tell is kyorolnd. It still has a buzz but much quieter. I think these games all have issues with the delta modulation channel. castelnu/kyorolnd have no buzz now but still no music in-game either. The Euro parent casteln doesn't work at all. romancia and the guardlgn games are also non-working. These remaining issues are probably due to poor DMC IRQ emulation.

No.12057

B2K24

Senior Tester

Oct 9, 2015, 14:20

I've heard similar and always just assumed it was something on my end.

No.19796

kmg

Senior Tester

Feb 18, 2022, 21:56

edited on: Feb 18, 2022, 22:10

The buzz issue seems to have been mostly fixed in https://github.com/mamedev/mame/commit/1f99365bbd49bedcb9bcfaef15b4cba7a6dbdd63 by cam900. The one exception that I can tell is kyorolnd. It still has a buzz but much quieter.

I think these games all have issues with the delta modulation channel. castelnu/kyorolnd have no buzz now but still no music in-game either. The Euro parent casteln doesn't work at all. romancia and the guardlgn games are also non-working. These remaining issues are probably due to poor DMC IRQ emulation.