A little history here:
All MSX2+ are japanese. Period. So all of them has more or less the same config and ROM structure.
Said that, here we go: In Brazil, all MSX2+ conversion kits were made by(or copied from) Ademir Carchano. We don't speak japanese, so we don't need KANJI ROM. So...All the brazilian converted MSX2+ have the same boot screen - a copy of the Turbo-R boot screen. It was done because the 2+ boot screen is coded on the KANJI ROM, dunno why, maybe there were not enough space on the SUB ROM to store it, as in the 2.0. Since brazilian kits has no KANJI ROM, Ademir inserted the turbo-r boot code into the SUB-ROM of his kits.
Needless to say, it is ugly. Seems the computer is not fast enough to run the screen code as fast as Turbo-R, so all the brazilian converted 2+ has this same ugly screen. Bad.
What do I want: I need to understand HOW the boot screens work. The 2+ has the boot screen code into the Kanji ROM, and I wasn't able to isolate the code. I want to isolate the original code of the 2+ boot screen, and insert that on the ROMs used by the brazilian 2+ kits. Before asking, I searched all the net (and some MRC) for this info and wasn't able to find. Some good soul could enlight me on this subject?
As soon as I get this, I'll write a page describing the entire mod. So any 2.0 converted to 2+ (yes, I'm talking also to you, philips owners) will have a most original 2+ with the proper boot screen.
The ROMs with the turbo-r boot code and FM music (F4 register and RTC disabled) are HERE: http://www.tabajara-labs.com.br/msx/conversao2plus/rom2plus.zip
As far as I know they can be used on any converted 2+. If your MSX board doesn't provide the address line A14 on the socket, you have to pull pin 27 of the SUB-ROM (27C256) and connect to line A14 of any of the slots. To test if your SUB-ROM socket has line A14 connected, measure continuity between pin 27 of the SUB-ROM socket and pin 25 of any of the slots (is the 13rd from left to right, on the botton). FYI the turbo-r code is from 7900 to 7FFF in this sub-rom.

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Thanks anyway!
(hint: upload?)