08814: dsaber: Namco System 2 - Dragon Saber Music Tempo Freaks out goes fast then slows down close to a freeze. Yamaha YM2151 and C140

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08814	Sound	Major	Always	Feb 1, 2024, 11:59	Feb 2, 2024, 01:55

Tester	vidpro1	View Status	Public	Platform	MAME (Official Binary)
Assigned To	hap	Resolution	Fixed	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	namco/namcos2.cpp
Version	0.262	Fixed in Version	0.263	Build	64-bit
		Fixed in Git Commit	ae8ec26	Github Pull Request #

Summary	08814: dsaber: Namco System 2 - Dragon Saber Music Tempo Freaks out goes fast then slows down close to a freeze. Yamaha YM2151 and C140
Description	I tried this on MAME 0.251 on ARM RPI5 and on Windows 10/11 0.262 not sure when this started happening.
Steps To Reproduce	The audio bug happens in the first minute of gameplay.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	dsaber

Attached Files

No.21935 hap Developer Feb 1, 2024, 15:04	MAME 0.213: no bug MAME 0.214: bug Somewhere around September 6, 2019 Suspected C140 timer IRQ: https://github.com/mamedev/mame/commit/48f831e0e58c033da3bf90ec1a7c90c7633b8f98 https://github.com/mamedev/mame/commit/6eb37a771465927c93de3fd93ae0ce74b6d189c1 I tried a bunch of things in c140.cpp but no luck.
No.21936 hap Developer Feb 1, 2024, 19:03	It should be fixed now.
No.21938 vidpro1 Developer Feb 2, 2024, 01:55	As always nice work hap.