4 replies to this topic

[SpiceWare]

The Care Bears in the prototype are fat, but detailed.


In checking out the prototype, Laura Nikolich used 2 copies of P0 with P1 lined up between the copies. While P1 is being displayed, she switches P0 to reflected mode.

  LDX #$08
  LDA ($90),y; left/right of Care Bear
LOOP:
  STA WSYNC
  STA GRP0
  LDA ($96),y; Color for center of Care Bear(note the nose on the pink bear and the ears on the yellow bear)
  STA COLUP1
  LDA ($92),y; center of Care Bear
  STA GRP1
  JMP ($0085) (precalced to jump to one of the following NOPs)
  NOP
  NOP
  NOP
  NOP
  NOP
  NOP
  NOP
  NOP
  NOP
  NOP
  NOP
  STX REFP0; P1 is being drawn, so flip P0 for the right side of the bear.
  INY
  LDA ($94),y; color for left/right of Care Bear (not use in the prototype)
  STA COLUP0
  LDA #$00
  STA REFP0; done drawing second P0 so flip back for next scanline
  LDA ($90),y; left/right of Care Bear
  BPL LOOP; if bit 7 of CareBear graphic is on then we're done drawing the bear.

Edited by SpiceWare, Wed Apr 11, 2007 5:27 PM.

[SpiceWare]

Oops - I meant to post this in Atari 2600 Programming, can a moderator move it for me?

[supercat]

SpiceWare, on Wed Apr 11, 2007 6:27 PM, said:

In checking out the prototype, Laura Nikolich used 2 copies of P0 with P1 lined up between the copies. While P1 is being displayed, she switches P0 to reflected mode.

Strawberry Shortcake probably does the same thing, but with the bonus of writing the color registers as well.

[SpiceWare]

This one writes all the color registers too - it's only noticeable on the nose of one bear and the ears of the other.

[Cybergoth]

That's pretty cool stuff.

Seawolf is doing a variant that is writing three different shapes instead of just reflecting left and right. P0 and P1 share the same color though. It also does the delaying jump outside the kernel, so instead of just NOPing time away it displays the torpedos