playerpointers question

[+atari2600land]

Suppose I have a code like so:

guy_anim
player1:
 %11000000
 %10000000
 %10000000
 %11111111
 %11111111
 %11111111
end

player0:
 %100000
 %100000
 %000000
 %110000
 %110000
end


return

t_2
player1:
 %11001100
 %10010000
 %10100000
 %11111111
 %11111111
 %11111111
end

player0:
 %011000
 %100000
 %000000
 %110000
 %110000
end

return

 

Would there be a way to use the player0pointerhi and lo to make it so I can only define the top line of player0 (and the bottom three lines of player1) since they're the only ones that change during the animation? I tried looking on RT's bB page but didn't see anything about the pointers in the index part. Maybe he should add some info about them.

[+Gemintronic]

This is not a complete answer in any way, shape or form.

 

SeaGtGruff came up with a way to use RAM for a sprite. Also, a way to use data aligned to the very bottom of the ROM but that's kinda sketchy.

 

It's at least something to search on.

[RevEng]

theloon's answer is the only way to do it, so far as I can see. Manipulating the playerpointers will allow you to "scroll" through a sprites data, but not change some bytes in one position without changing others.