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For AGA colours you bank in/out banks of 32 colours and upper/lower 12-bit halfs of the 24-bit colour.
Which means that on boot-up it will default to the first 32 colours and upper 12 bits.
Incidently, writing to the upper 12 bits will copy the exact same value to the lower 12 bits. So write the lower 12 bits last.
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