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First Embryo of a Generic Memory mapper, limited to 256KB

In my search for the mapper to the SVI738 i came a cross different mapper, schematics and information how people have solved this, but my idea is to create a internal mapper and replace on-board 64KB with 256KB to have a full MSX2/MSX2+ after upgrade, issues I found was that the ULA that handle the SLT3-x is not correct, so that is part of the ULA project. This mapper is very simple and can easy be implemented to other MSX computer. So after doing some reverse engineering and

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