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NAME   rev ADDR type chip Description
BLTSIZE      058   W    A Blitter start and size (win/width, height)

         This register contains the width and height of the blitter operation
         (in line mode width must = 2, height = line length). Writing
         to this register will start the Blitter, and should be done last,
         after all pointers and control registers have been initialized.

         BIT# 15,14,13,12,11,10,09,08,07,06,05,04,03,02,01,00
              H9 H8 H7 H6 H5 H4 H3 H2 H1 H0 W5 W4 W3 W2 W1 W0

         H=Height=Vertical lines (10 bits=1024 lines max)
         W=Width=Horiz pixels (6 bits=64 words=1024 pixels max)