Figure 4-2 Position Of Sprites - Commodore Amiga Hardware Reference Manual

Desired X position 94
32 off-screen lines +64
158
Thus, 158 becomes the X value, which will be written into the data structure.
Note that the X position represents the location of the very first (leftmost) pixel in the
full 16-bit-wide sprite. This is always the case, even if the leftmost pixels are specified as
transparent and do not appear on the screen. If the sprite shown in figure 4-2 were
located at an X value of 158, the actual image would begin on-screen four pixels later at
162. The first four pixels in this sprite are transparent and allow the background to
show through.
4
Figure 4-2: Position of Sprites
Vertical Position
You can select any position from line 0 to line 262 for the topmost edge of the sprite.
The normal usable range of the video screen, however, is from line 44 through line 243.
This allows the normal display height of 200 lines in non-interlaced mode. If you specify
a vertical position (Y value) of less than 44, the top edge of the sprite may not appear
on screen.
To make a sprite appear in its correct on-screen vertical position, add 44 to the desired
position. For example, to make the upper leftmost pixel appear 25 lines below the top
edge of the screen, perform this calculation:
94 Sprite Hard ware