Writing to port #7Fxx with bit 7 and bit 6 of data set to 1 can be used to set page 3 RAM bank in Aleste mapper mode, or to define CPC RAM configuration in CPC mode.
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See also: [[Standard Memory Expansions]]. '''Actually''', it seems to work more like an [[Inicron expansion RAM-Box]] (which isn't fully compatible with the dk'tronics standardstyle [[Standard Memory Expansions]]).
== Upper ROM Bank ==