Mapper 227 : Bug with B-Wings
nb5846 opened this issue · comments
For this rom that uses the mapper 227 : romMulticart.nes
(md5sum => fcd14358d45211b5887b69be3405a1be)
It seems that there is a bug with the game B-Wings :
Music ok but blue screen and no gamepad
It's probably necessary to add CHR RAM write-protection for fixing this bug.
Bug for the entry in the menu :
16 - B-Wings
...
I try this multicart dump with Nestopia UE 1.50.
This B-Wings entry seems to work nearly correctly with libretro-fceumm (retroarch).
Could someone correct this bug ?
https://www.nesdev.org/wiki/INES_Mapper_227
It appears there has been a submapper assigned unofficially for this, in order to denote CHR RAM write protection. It should be trivial to add, but this is likely going to require a database entry.
I have corrected the header of the dumpfile in my first message and set it to the submapper 1 as described in the wiki.
I've gotten it working, but I will need to clean up some of the code to handle the difference between submapper 0 and 1 correctly.
Here is the solution: https://gitlab.com/jgemu/nestopia/-/commit/de400b4f503d7681e2ec2c6db5b5ed96ff94ff94
Thank you very much for your work.
From which nestopia version number will your correction be available ?
This will be available in a tagged release of 1.52.1 or 1.53.0, depending on how many other things are added before the release. You can use it now by building Nestopia JG, which I have made quite easy for anyone with a development environment to do.
OK. Thank you very much to you.