NAME   rev ADDR type chip Description
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BLTSIZV  h 05C  W    A    Blitter V size (15 bit height)

         BIT# 15  14  13  12  11  10  09 08 07 06 05 04 03 02 01 00
               x  h14 h13 h12 h11 h10 h9 h8 h7 h6 h5 h4 h3 h2 h1 h0

         These are the blitter size regs for blits larger than the earlier
         chips could accept. The original commands are retained for
         compatibility. BLTSIZV should be written first, followed by BLTSIZH,
         which starts the blitter. BLTSIZV need not be rewritten for
         subsequent bits if the vertical size is the same. Max size of
         blit 32k pixels * 32k lines, x's should be written to 0 for
         upward compatibility.