Register Descriptions
The display controller registers are mapped into the I/O space at addresses 03B0h-03BFh
or 03D0h-03DFh, and at 0022h-0023h. The first two ranges correspond to standard
PC-compatible MDA and CGA registers, respectively.
Only one of these ranges may be selected at a time. The last range is where all
non-standard hornet registers are accessible via indexing. A portion of these registers
are used for display setup and compatibility selection.
Graphic
