Active Video Line MSB Register
|Short Description||Holds the MSB (only, as bit 0) of the raster line currently being drawn.|
The low 8 bit part of the raster line number is in Active Video Line LSB Register ($1F).
The line coordinates use coordinate system of Copper coprocessor, i.e. line 0 is the first line of pixels.
Since core 3.1.5 the numbering of lines can be offseted by Vertical Video Line Offset Register ($64).