The PowerBASIC is fixed now, I've replaced the files with the ones found in the downloaded version and now it boots fine. I've tested some demos and works flawlessly, well, sort of, seems that the RGB has some kind of problem with a wire (red pin must be loose). I need to do some more test with another TV set just to be sure that's not my problem.
There're tons of info out there!, first I'll try to find the differences between GBASIC and PowerBASIC...
POwerBasic is written by Henrik Gilvad and is for turboR only, AFAIK.
GBasic is written by Koen van Hartingsveldt, and works on any MSX (not sure about MSX1). The manuals are online, see also the GFX9000 section on the FAQ: http://faq.msxnet.org/gfx9000.html
GBasic doesn't support the pattern modes, by the way. It does support Video9000 though :)
