* CPC464/664 - The 464 and 664 only scan and initialise ROMs 7 to 0 at start-up. ROMs 15 to 8 are only accessable if manually initialised.
* CPC6128 - Classic CPC6128 can not overwrite the internal ROM7 ROM 7 with an external device, to make use of the external ROM7 ROM 7 the CPC must be modified to allow the internal ROM7 ROM 7 to be disabled (eg: By adding a switch to the internal ROMs Chip Enable pin)