Changes
/* 576KB vs 640KB total */
The internal RAM of the CPC 6128 adds 1x 64K, which is usually disabled by expansions, because at the same address range (&7Fxx).
But, if the expansion RAM decodes the A8 address line, you can still access this bank page from another range (&7Exx), like X-MEM does. [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/extram-512kb-to-640kb-for-cpc6128-on-one-dip20-chip-slg46533v-dip/msg247825/#msg247825 Source]
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