Changes
/* Internal PAL on CPC 6128 */
[[File:Amstrad.cpc6128.pal.ga.jpg]]
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== 576KB vs 640KB total RAM ==
Bits 3, 4, 5 allow to define up to 8 banks of 64K for RAM expansion at a given address range. This does not affect the 64K base RAM.
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 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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