NAME   rev ADDR type chip Description
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SPRxPTH    120  W    A      Sprite x pointer (High 5 bits)
SPRxPTL    122  W    A      Sprite x pointer (low 15 bits)

	This pair of registers contains the 20 bit address
	of sprite x (x=0,1,2,3,4,5,6,7) DMA data.These address
	registers must be initalized by the processor or coprocessor
	every vertical blank time.