problem with sprite double/quad size X position

[jab]

Hi, if I try to position a sprite with NUSIZ = 5 (double) or NUSIZ = 7 (Quad) the X position is shifted right of a pixel.

With NUSIZ = 0 position is correct.  (the background white is PF2 playfield used to test)

GRP0 and GRP1 = $FF

Is it correct? 

Thanks Alberto

 

NUSIZ = 0 

 

NUSIZ =5 

 

NUSIZ = 7

[Dionoid]

Yes, that is expected behavior. Normal size player objects take 5 TIA color clock cycles to display after their RESPx strobing, but double and quad size player objects take an extra color clock cycle to display (so 6 TIA color clocks), effectively displaying them one pixel to the right when compared to normal size player objects.

And note that ball and missile objects always take 4 color clocks after the RESBL/RESMPx strobing, independent of their size. So that means that they are displayed 1 pixel to the left, when compared to normal size player objects.

 

See also:

 

Edited June 25 by Dionoid

[jab]

12 hours ago, Dionoid said:

Yes, that is expected behavior. Normal size player objects take 5 TIA color clock cycles to display after their RESPx strobing, but double and quad size player objects take an extra color clock cycle to display (so 6 TIA color clocks), effectively displaying them one pixel to the right when compared to normal size player objects.

And note that ball and missile objects always take 4 color clocks after the RESBL/RESMPx strobing, independent of their size. So that means that they are displayed 1 pixel to the left, when compared to normal size player objects.

 

See also:

 

Thank you. 

Regards Alberto