Changes
/* PAL MMR register */
On a standard 128k machine (unexpanded), bits5..3 are ignored. Page will always be fixed to Page 0.
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=== RAM mode &C3 ===
The CPC 464/664 cannot deal with A14/A15 for Base 64k page like the 6128 does.
So external RAM expansions can differ in their behaviour regarding &C3 mode. See [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/464-preasic-c3-ram-configuration-and-rom-7/ Discussion on the forum] and [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/dk%27tronics-ram-c3-selection-464/ Another discussion]
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