09240: nbapbp and clones: Music tempo too slow compare to real hardware

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09240	Sound	Minor	Always	Aug 12, 2025, 22:09	5 days ago

Tester	yoshi200213	View Status	Public	Platform	MAME (Official Binary)
Assigned To	hap	Resolution	Fixed	OS	Windows 11/10 (64-bit)
Status [?]	Resolved			Driver	konami/hornet.cpp
Version	0.279	Fixed in Version	0.281GIT	Build	64-bit
		Fixed in Git Commit	c8b762c	Github Pull Request #

Summary	09240: nbapbp and clones: Music tempo too slow compare to real hardware
Description	hello the video game nba play by play has the music tempo too slow compare to real hardware this is noticebla in the intro when the music It's so slow that it causes the intro cinematic and the music to be out of sync.
Steps To Reproduce	start the game see the intro music too slow
Additional Information	heres a comparison mame real hardware ?si=cpJGfyVUxv6oKZ46 also when you overclock the audio cpu to 400% the intro music is sincronice with the video.
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	nbapbp and clones

Attached Files

No.23632 Robbbert Moderator 13 days ago edited on: 12 days ago	~~The video of real hardware is a private video. Please remove it or change its status.~~ Fixed, thank you.
No.23643 Kale Developer 9 days ago edited on: 9 days ago	Sound irq frequency is tied to a variable, m_sound_timer_usec = 2800 and a verify with real HW note. It also implies with no configuration, for all games in the driver.
No.23663 hap Developer 8 days ago	The implementation was weird: it retriggered the sound irq timer after irq ack. I removed that, and combined with a fixed 344.5Hz* freq (measured by Guru), it's correct now. 344.5 = 44100 / 128, probably originates from sound chip.
No.23672 danylopez123 Tester 5 days ago edited on: 5 days ago	This problem also happened for the nwk-tr hardware games. I'm not sure if other games using the Ricoh RF5C400 sound chip aren't affected by this.
No.23673 hap Developer 5 days ago	Yes, the fix is for gticlub.cpp, hornet.cpp, nwk-tr.cpp See "Fixed in Git Commit" link above.