New changes:

* Colors are now 'packed' 4 to a byte in a bizarre format, and unpacked during front-porch into 24 RAM bytes. This saves me a lot of ROM space. Bumped up max sprite height from 21 to 24 lines, and added two alternating player colors. (Incidentally the PAL60 version will feature blue-haired ninjas...)

* Everything is now table-driven - no hardcoded values - so I can feel free to draw sprites of any height and run them through my bmp2h program, and they should Just Work.

* Animations! My animation setup is going well enough to allow Player 0 to engage the 'walk' sprite when pressing Right on the joystick. I took a screenshot of that in action, but it's hard to tell since they look very similar.

Next up I need a lot more sprites and to define some more moves, plus allowing animations to change Player X and Y values.