Algo3

[sage]

Anyone played bit with algo3? Even so the EPXY doc says "algo 3 is broken"?

 

It seems that some circuits are left which work, but mainly for Y.

[+karri]

I remember seeing this note at some point in time. What was algo3 supposed to do?

[sage]

as far as I can tell, it should use a 16 bit mask to select the pixels from the sprite.

 

in Y it somehow seem to do something (but somehow only every second line), but it wont work for X, will stop after few columns.

[enthusi]

You probably saw it here:

FC81 = SPRCTL1 Sprite Control Bits 1 (W)(U)

reset x,x,x,x,x,x,x,x

 

B7 = literal attribute, 0=normal, 1=totally literal

B6 = Sizing algorithm choice, 0=adder (algo 4), 1=shifter (algo 3)

SET IT T0 ZERO!!!!, algo 3 is broke

 

Not too helpful, though.

[sage]

I found a better description somewhere

[+karri]

Thanks. Actually I don't really need masked stuff anymore. The "shaped" version combined with a programmable start quadrant takes care of my needs. The only slight problem I have is that tilt/stretch tears the sprite from the anchor point. So in order to tilt my car I need to keep the sprite in one segment.