[Coco] Impossibly-fast CoCo 3 sprites :)

[Roger Taylor]

Another milestone was reached this evening when I finished the 
routines that take bitmapped sprite/mask tables and convert them into 
6809 opcodes, at run-time.

What does this mean?  It means I'm now watching 64 (16wx15h) 16-color 
various shaped sprites zip around the screen retaining the background 
they pass over, only this time it's at least 8x the framerate of the 
previous optimized version that reads from the tables, masks, or's 
and rewrites the screen.   All of that is now eliminated and the 
sprite routines themselves are self-contained, needing no external 
sprite data, masks, previous screen data.  Transparent parts of the 
sprite aren't even looked at.  Both 1- and 2-byte writes are handled 
automatically, saving CPU cycles whereever possible.

Talk about fast!