Definition of Mode-X
320x240x8bpp un-chained. ModeX is a term that Michael Abrash invented. This
is an un-chained video mode, which means that you have to use a form of bank
switching to access all the screen memory. Some benefits of this mode
are hardware page flipping, multiple on-card virtual buffers (sometimes
referred to as double buffers), fast horizontal line fills (used for
*very* fast solid filled polygons), and hardware scrolling. Some drawbacks
of this mode are that it is difficult to code for and isn't any faster than
Mode 13h on a PC today. This mode isn't supported by our VESA library, since
it is outdated and doesn't offer anything we can't already do in a higher
resolution through software.
