Viewing Issue Advanced Details
|ID||Category [?]||Severity [?]||Reproducibility||Date Submitted||Last Update|
|08578||Sound||Minor||Always||22 days ago||19 days ago|
|Tester||danylopez123||View Status||Public||Platform||MAME (Official Binary)|
|Assigned To||hap||Resolution||Fixed||OS||Windows 10/11 (64-bit)|
|Version||0.252||Fixed in Version||0.253GIT||Build||64-bit|
|Fixed in Git Commit||506e00a||Github Pull Request #|
|Summary||08578: snowbro2: The OKI MSM6295 sound chip haves lower MHz|
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|
|Flags||Verified with Original|
|Affected Sets / Systems||snowbro2|
sb2_xtals1.jpg (315,851 bytes) 22 days ago Uploaded by Haze
sb2_xtals2.jpg (332,857 bytes) 22 days ago Uploaded by Haze
|There are no relationship linked to this issue.|
22 days ago
edited on: 22 days ago
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.
21 days ago
OKIM6295(config, m_oki, 27_MHz_XTAL/10, okim6295_device::PIN7_HIGH);
so simply change to this?:
OKIM6295(config, m_oki, 27_MHz_XTAL/8, okim6295_device::PIN7_HIGH);
which makes it the same as the YM clock in the driver.
21 days ago
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?
20 days ago
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, 16_MHz_XTAL/4, okim6295_device::PIN7_LOW);
Yes I agree the cpu should be 32/2