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NAME   rev ADDR type chip Description
BLTxPTL  h 052  W    A    Blitter Pointer to x (Low 15 bits)

         This pair of registers (see also: BLTxPTH)
         contains the 20 bit address of Blitter source (X=A,B,C) or dest.
         (x=D) DMA data. This pointer must be preloaded with the
         starting address of the data to be processed by the blitter. After
         the Blitter is finished it will contain the last data address
         (plus increment and modulo).