05805: dinohunt: [possible] Unused YM2151 chip?

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05805	Sound	Minor	Always	Dec 21, 2014, 03:21	Dec 24, 2014, 14:01

Tester	darq	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	capcom/cps1.cpp
Version	0.156	Fixed in Version	0.157	Build
		Fixed in Git Commit		Github Pull Request #

Summary	05805: dinohunt: [possible] Unused YM2151 chip?
Description	The game seems to use only the OKI6295 for both sfx and music. Apparently the game has one background music only (!), you can hear the loop at the end of the u19 rom. To test it, I have executed only the 2nd CPU (by manually set the sound latch values) and there is no access to YM2151 ports, nor unlogged writes. PS: To make the sounds work, you have to just return 0xFF at (0xF18000 - 0xF19FFF) instead of install_ram with 0xFF fill. I think that the values written are only qsound leftovers (after a lot of 0xFF values, there is the same qsound starting sequence, eg: 0x88, 0xFF, 0x0B, 0x00, 0x00, 0x00, ...).
Steps To Reproduce
Additional Information
Github Commit

Flags	Possible, Verified with Code
Regression Version
Affected Sets / Systems	dinohunt

Attached Files

No.11321 Osso Moderator Dec 24, 2014, 10:28	Credits to darq. For the time being, I didn't move the game to different memory map and machine. I will do it when it's confirmed the ym2151 isn't present on the PCB.
No.11322 darq Tester Dec 24, 2014, 14:01	Thanks! I am also curious about that. Another interesting thing (if someone can test it), would be to know if the real PCB has an EEProm and also if it gives errors in the first two rows (Service Mode / Memory Check). Anyway, happy Christmas Eve to all! :)