Blitter start and size (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)