WARNING: No general registers are preserved.

Change the current video mode and re-intializes the CRT subsystem.

If Mouse support has not been disabled with the %define NO_MICE conditional define and a mouse is present. The mouse will be reset and hidden. A call to MouseShow will be needed to make the mouse visible again.

Common NON-VESA modes:

For other possible text modes below 0x0100 on real hardware, consult the video mode table in Ralf Brown's Interrupt List.

Examples:

    TextMode bx
    TextMode 3
    TextMode 0x010c
    TextMode [USER_MODE]

See also: GetTextMode, ResetMode and RequireTextMode