Just in case someone gets curious, here are some photos

www.tabajara-labs.com.br/temp/expert2plus.jpg
www.tabajara-labs.com.br/temp/expert2plus_2.jpg

This is my attempt to convert a brazilian 2.0 into a 2+
- Changed 9938 to 9958
- implemented &hF4 register
- changed Main/Sub ROM

working 80%. I can get to basic, change video modes, run some programs, but specific 2+ programs seems to have a hard time running. Seems a ROM problem, but my lack of knowledge in MSX hardware isn't helping so much.

I'll get there, it is just a matter of time. Stay tuned!
Alexandre, the mad scientst.