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ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08179 Sound Minor Always 13 days ago 11 days ago
Tester vidpro1 View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10/11 (64-bit)
Status [?] Confirmed Driver fantland.cpp
Version 0.239 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 08179: galaxygn: Galaxy Gunners and Fantasy Land - Yamaha YM2151 Sound Frequency pitch incorrect? Have youtube video of PCB
Description I found a video of a Galaxy Gunners and Fantasy Land PCB on youtube. Sounds like the frequency setting on the Yamaha chip is too low anyone else have a PCB? Unfortunately the audio volume is too low on youtube. It sounds like it is off by 30% -33% pitch match test with -debug overclock ymsnd 133%
Maybe the YM2151 OPM needs to be at 4MHZ? Probably all the games on that hardware driver have the wrong frequency.







ym2151_device &ymsnd(YM2151(config, "ymsnd", 3000000));
ymsnd.irq_handler().set(FUNC(fantland_state::galaxygn_sound_irq));
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Affected Sets / Systems galaxygn
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2
User avatar
No.19690
Osso
Developer
13 days ago
In the following link there's a Galaxy Gunners PCB where the visible XTAL in the audio section is 8 MHz. So maybe 8 MHz / 2 for the YM2151?

https://arcadeclassics.com.au/arcade_games/video-game-pcbs/galaxy-gunners/
User avatar
No.19694
Fujix
Administrator
11 days ago
It sounds just like the video by setting sound clock at 133%.