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Drymouth - black screen flashes

Posted: Tue Mar 18, 2008 9:27 pm
by Dwedit

Drymouth (a homebrew game by Demiforce) has issues.

During the intro, there are times where the screen flashes black below a certain scanline. I think it might be related to inappropriate use of the STOP instruction. I've never seen what the game does on actual hardware, so I can't tell whether it's correct or not, but I'm sure that shouldn't be there.

There are also times during gameplay where the screen flashes black, such as right when the playfield appears. Again, I do not know its actual behavior on hardware. It might be doing something illegal.


Drymouth - black screen flashes

Posted: Tue Mar 18, 2008 9:31 pm
by mudlord

I'm curious how other emulators handle it...

 

Do they work out okay with it?


Drymouth - black screen flashes

Posted: Tue Mar 18, 2008 9:45 pm
by Dwedit

Other emulators either ignore the STOP, or treat the stop as a HALT.


Drymouth - black screen flashes

Posted: Fri Mar 21, 2008 7:25 pm
by mudlord

Do you know when this first broke or is this a original issue altogether?


Drymouth - black screen flashes

Posted: Sun Apr 20, 2008 2:39 pm
by Dwedit

As far as I know, it's been in there since before VBA-M was started.


Drymouth - black screen flashes

Posted: Sun Apr 20, 2008 8:39 pm
by SCHUMI4EVER

Have you tried some of Forgotten's original VBA builds aswell?


Drymouth - black screen flashes

Posted: Tue Apr 22, 2008 6:03 pm
by Dwedit

VBA Rerecording v20 (based on forgotten's unfinished beta) has the same exact problems.


Drymouth - black screen flashes

Posted: Tue Apr 22, 2008 7:28 pm
by mudlord

Least thats a lead.

 

Sorry for not acting on your reports as of yet, I have been extremely busy with my university work, so I haven't had much time lately to sit down and sift through the VBA code to fix up those issues [img]<fileStore.core_Emoticons>/emoticons/sad.png[/img]/emoticons/sad@2x.png 2x" width="20" height="20" />


Drymouth - black screen flashes

Posted: Sat May 03, 2008 4:48 pm
by Dwedit

Each time Drymouth gives a black screen, it is performing a speed switch.


Drymouth - black screen flashes

Posted: Sat May 03, 2008 9:25 pm
by Squall Leonhart

Thanks for the info Dwedit, if you come across any more findings please post them, the more info we have the quicker the problem will be to pin point and hopefully fix.