The kernel console is a low-level implementation that only provides
the minimal features necessary and/or useful for debugging the kernel
and low-level user software.  Currently, only the System.IO.OStream
interface is required to be implemented.  Video-based consoles will
likely also have an interface that allows one to request a video mode
change to display a catastrophic error message, but that can wait
until there are user space programs that change the video mode.