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Old 18 August 2005, 18:14   #6
Toni Wilen
WinUAE developer
 
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 47
Posts: 25,364
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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