Mode Action
0-15 logical col = actual col
16 logical colour = RGB
17 first flash = RGB
18 second flash = RGB
24 Border colour = RGB
25 Pointer col = RGB
Add 128 to set supremacy bit.
On early machines only the top four bits of R G and B were used (for a total of 4096 available colours), and the top 4 bits had to be copied into the bottom 4 bits by the programmer to ensure the display would remain the same on a 16M colour (24-bit) system.
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