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C397: Move Sun Moon
Used by the routine at DrawChangedObjects.
Moves the sun or moon along the arc in the window of the panel by one pixel, on one frame in eight, and shows it.
MoveSunMoon C397 LD A,($5BA2) Fetch the frame counter from FrameCounter.
C39A AND %00000111 Keep the lowest three bits.
C39C RET NZ Return unless it is one frame in eight.
C39D LD IX,$C44D Point IX at SunMoonObject.
C3A1 INC (IX+$1A) Move the sun/moon one pixel to the right.
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