View Single Post
Old 18 August 2005, 18:14   #6
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 48
Posts: 25,947
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)
Toni Wilen is online now  
Page generated in 0.07318 seconds with 10 queries