Changes

The MegaROM is compatible with all 464, 664, 6128, 464+ and 6128+. It's compatible with the usual expansions for the CPC like and can be used to host standard ROM images such as [[AMSDOS]], [[BCPL]], [[FutureOS]], [[MAXAM]], [[Protext]], [[Utopia]], [[VDOS]], [[XD-DOS]]. The MegaROM fully decodes the Address and Data buses, so it should not clash with any other official expansions installed in parallel or plus cartridges.