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Note: <br> == Pre-ASIC == The Pre-ASIC chip contains the PAL component internally. But it is disabled by default on the CPC 464/664 cannot deal with A14/A15 for Base 64k page like the 6128 does. So external RAM expansions can differ It is possible to enable it by doing an hardware modification explained in their behaviour regarding &C3 mode. See that article: [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/464-preasic-c3-ram-configuration-and-rom-7/ Discussion on the forum[Arnold4] and [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/dk%27tronics-ram-c3-selection-464/ Another discussion]
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