Changes

4 MB DRAN internal memory expansion for CPC. It's compatible with external memory expansions (Dk'tronics, Inicron RAM-BOX), using port #7Fxx. Additional 3,5MB can be used trough ports #78xx to #7Exx(see [http://8bit.yarek.pl/upgrade/cpc.cpc4mb/index.html CPC4MB] Page, for futher details).