=== Extra memory ===
CPM+ on the CPC uses 128KB of memory. Therefore selections C4,C5,C6,C7 must be avoided if you have additional memory. Due to the design of DkTronic's compatible RAM expansions all memory accesses to additional RAM must occur from bank 0 (i.e. 'C0C1') and be transferred to the TPA in bank 1 (i.e. 'C2').
Therefore access to the additional RAM follows a pattern such as this: