MAMEWorld Central >> EmuChat
View all threads Index   Flat Mode Flat  

AJR Hacker
MAME Fan
Reged: 02/01/16
Posts: 40
Send PM
Re: double wings Soundlatch modernization?
08/30/17 07:32 PM


Double Wings wasn't on my list, but I indeed found something to improve with the soundlatch handling. The sound writes are obfuscated through a DECO 104 protection ASIC, which used to be the reason the game was not working in MAME for a long time. That turned out to be a red herring; it looks more like the sound code wants command writes to take priority over a constant barrage of timed interrupts from the YM2151. The old code was acknowledging soundlatch writes on every IRQ, no matter what the source, which is probably not how that was supposed to work. Some sound-related mysteries still exist, but overall it looks like a slight improvement.






Entire thread
Subject Posted by Posted on
* double wings Soundlatch modernization? jasd 08/29/17 10:21 AM
. * Re: double wings Soundlatch modernization? AJR Hacker  08/30/17 07:32 PM
. * Re: double wings Soundlatch modernization? MooglyGuy  08/29/17 10:31 AM
. * Re: double wings Soundlatch modernization? jasd  08/29/17 10:46 AM
. * Re: double wings Soundlatch modernization? Haze  08/29/17 01:57 PM
. * Re: double wings Soundlatch modernization? gamez fan  08/29/17 11:38 PM
. * Re: double wings Soundlatch modernization? Haze  08/30/17 12:10 AM
. * Re: double wings Soundlatch modernization? jasd  08/29/17 02:32 PM

Extra information Permissions
Moderator:  redk9258, URherenow, Tafoid 
2 registered and 29 anonymous users are browsing this forum.
You cannot start new topics
You cannot reply to topics
HTML is enabled
UBBCode is enabled
Thread views: 516