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|2||MAPMOD
* When MAPMOD=0: Uses CPC-style 27-color palette , and CPC6128-style RAM banking* When MAPMOD=1: Uses MSX-style special 64-color palette , and MSX-style extended RAM mapper(the MSX-style stuff is MSX-inspired, but not compatible with real MSX I/O addresses)
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|1||Enables high resolution in X. Also changes some clock frequences. Controls decoding of video address.