The Google Serial Graphics Adapter BIOS, or
SGABIOS, provides a means for legacy x86 software
to communicate with an attached serial console as
if a video card were attached. It is designed to
be inserted into a BIOS as an option ROM to
provide over a serial port the display and input
capabilities normally handled by a VGA adapter and
a keyboard, and additionally provide hooks for
logging displayed characters for later collection
after an operating system boots. It is designed to
handle all text mode output sent to the legacy
video BIOS int 10h service routine. Int 10h is the
most common method for displaying characters in
16-bit legacy x86 code.
