Active Video Line (MSB) Register
From SpecNext Wiki
| Next Register Number | $1E |
|---|---|
| Readable | Yes |
| Writable | No |
| 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 NextReg:$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 NextReg:$64.