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Mysterious world of blitter line mode..
- D-channel can be disabled. No effect on anything.. (even speed of blit stays the same)
- C must be enabled (nothing is drawn without C)
- B (not tested)
- disabling A stops BLTAPT from updating (result is incorrect lines)
- BLTDMOD is not used in line mode. BLTCMOD is used for both C and D.
And here is the most interesting undocumented feature ever:
- First pixel is written to address pointed by BLTDPT, all following pixels are written to address pointed by BLTCPT! (Demos Cardamon and Cardamom)
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