Address		Section Description
5B74		Clear Screen / Draw Grid
516F		Draw Clouds
32BF		Graphic Logo Print 2
305E		Graphic Logo Print 1
2A9		Draw Ship (BLIT)
5B4B		Load Palette
742		Horizontal String Print
5186		Ocean Palette Setup
711		Score Print
C3A		Dogfight Aces Attract Screen Print
1C8		Explosion Palette Update
5DFB		Nightfall Palette Table
211		Nightfall Using Table 
75F		High Score Entry String Print
7C4		High Score Entry A-Z Print
ABC		High Score Table Attract Mode Print
93B		High Score Graphics Print
826		Print '&' Between Names
5513		Clear Sink Info Text
753		Vertical String Print

This list is far from exhaustive, and does not include all of the tiny mods I may have made in the patch, but it should get you started on your way to modifying the code, ore writing your own.