08578: snowbro2: The OKI MSM6295 sound chip haves lower MHz

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08578	Sound	Minor	Always	Mar 6, 2023, 02:34	Mar 9, 2023, 19:55

Tester	danylopez123	View Status	Public	Platform	MAME (Official Binary)
Assigned To	hap	Resolution	Fixed	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	toaplan/toaplan2.cpp
Version	0.252	Fixed in Version	0.253	Build	64-bit
		Fixed in Git Commit	506e00a	Github Pull Request #

Summary	08578: snowbro2: The OKI MSM6295 sound chip haves lower MHz
Description	While listening to the VGM pack, i asked myself: How come in this pack, the OKI sound chip sounds slightly faster than the how i heard it in MAME? I checked the info file and it says: I changed 2700000Hz to 3300000Hz from the clock OKIM6295 based on the Sound of the real hardware. If i want to verify this, i tried to search if there's any video of Snow Bros 2 being played from an actual PCB, to my surprise, i've managed to find one, it's from a Spanish youtuber. I could tell at the beginning of the attract/intro sequence listening to the Girl's Scream, in that video, it sounds with a Higher pitch. I know the dude in the video talks alot but you can kinda hear the voices from the game. Here's the video: And here's the VGM pack where i saw the info file: https://vgmrips.net/packs/pack/snow-bros-2-with-new-elves-toaplan-2
Steps To Reproduce
Additional Information
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	snowbro2

Attached Files	sb2_xtals1.jpg (315,851 bytes) Mar 6, 2023, 18:42 Uploaded by Haze
Attached Files	sb2_xtals2.jpg (332,857 bytes) Mar 6, 2023, 18:43 Uploaded by Haze

No.21148 Haze Senior Tester Mar 6, 2023, 18:43 edited on: Mar 6, 2023, 18:58	There is no 33Mhz XTAL on the original PCB, the one closest to the sound section is 16. It is likely the clock should be derived from that 16Mhz XTAL though, as 27mhz is for the video, while the 32 is for the CPU.
No.21149 hap Developer Mar 7, 2023, 14:02	OKIM6295(config, m_oki[0], 27_MHz_XTAL/10, okim6295_device::PIN7_HIGH); so simply change to this?: OKIM6295(config, m_oki[0], 27_MHz_XTAL/8, okim6295_device::PIN7_HIGH); which makes it the same as the YM clock in the driver.
No.21151 Haze Senior Tester Mar 7, 2023, 23:43	It still seems unlikely that the sound clocks would derive from the 27 on these to me. 32/2 makes sense for the CPU 27 is confirmed as the video on multiple Toaplan boards the 16 in the sound section is surely where the sound clocks come from?
No.21153 hap Developer Mar 8, 2023, 11:14	YM clock is correct, when comparing to the video, it can't be from the 16MHz XTAL. My ears say the OKI clock is this: OKIM6295(config, m_oki[0], 16_MHz_XTAL/4, okim6295_device::PIN7_LOW); Yes I agree the cpu should be 32/2