This explains why the Amstrad engineers used the following values to adapt the old colour palette to the new 12-bit palette on the Amstrad Plus:
* 0% became #0
* 50% became #6. They specifically chose #6 for the 50% value instead of the expected #7 or #8, to better match the real Amstrad CPC palette.
* 100% became #F
They specifically chose #6 for the 50% value instead of #7 or #8, to better match the real Amstrad CPC palette.
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