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o
Sprite position registers. These registers, called SPRxPOS, contain the horizontal
position value (X value) and vertical
positio~
value (Y value) for each of the eight
sprites.
o
Sprite control registers. These registers, called SPRxCTL, contain the stopping posi-
tion for each of the eight sprites and whether or not a sprite is attached.
o
Beam counter. The beam counter tells the system the current location of the video
beam that is producing the picture.
o
Comparator. This device compares the value of the beam counter to the Y value in
the position register SPRxPOS. If the beam has reached the position at which the
leftmost upper pixel of the sprite is to appear, the comparator issues a load signal to
the serial-to-parallel converter and the sprite display begins.
Sprite Hardware
121
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