On the CPC 6128 schematic, it is top centre: [http://www.cpcwiki.eu/imgs/4/4a/CPC6128_Schematic.png CPC6128 Schematic] however the X inputs aren't distinguished.
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== 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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== PAL I/O port ==
For compatibility reasons, it is strongly advised to always set bit14 to 1 to select PAL.
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== PAL Type Detection ==
Note: The CPC 464/664 cannot deal with A14/A15 for Base 64k page like the 6128 does. So external RAM expansions 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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== Initial replacement equation (Porchy) ==
[[File:Amstrad6128.jed]] Original JED File posted on CPCWiki Forum
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== Fixed version (Gerald) ==
[[File:CPC6128.hex]] : Fixed version of Amstrad 40031 GAL replacement, Hex Intel version.
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== See also ==