Flubba posted this news about his WIP MSX emu for GBA:

I have now added a virtual keyboard which also is used to remap the GBA keys, 32kB RAM is available now which means the Basic can be used, I struggled a lot with Kings Valley II which refused to work when I added the RAM, but I finnaly fixed that as well. I'm also messing around with the html on this page, I hope it still works.

More info --> http://hem.passagen.se/flubba/gba.html