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AGA BPLCON0 BYPASS bit:
As documented, it bypasses palette selection but it also ignores "special" bits.
- if HAM: HAM control bits (planes 5 and 6 if HAM6, planes 0 and 1 if HAM 8) do not appear in output. In other words, HAM6: value range is 0 to 15. HAM8: low 2 bits are always zero.
- if EHB: EHB plane 5 does not appear in output. (Range is 0 to 31)
- Output is grayscale, output value is copied to all color component bits, not just red.
- Sprites seem to work exactly like bitplanes, palette is bypassed and sprite's palette index value appears in output.
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