* bits3..2 are X magnification (00 = not displayed, 01 = x1, 10 = x2, 11 = x4)
* bits1..0 are Y magnification (00 = not displayed, 01 = x1, 10 = x2, 11 = x4)
Sprite coordinates are internally based on the value of the internal counters of the CRTC. Sprite X coordinate is based on HCC. Sprite Y coordinate is based on VCC and VLC.
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