This pair of registers contains the 32-bit word address of Sprite 0 DMA
data.

Pointer register names for the other sprites are:

                    SPR1PTH    SPR1PTL
                    SPR2PTH    SPR2PTL
                    SPR3PTH    SPR3PTL
                    SPR4PTH    SPR4PTL
                    SPR5PTH    SPR5PTL
                    SPR6PTH    SPR6PTL
                    SPR7PTH    SPR7PTL