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     In text modes, this function selects only the border color. The
     background color of each individual character is controlled by
     the upper 4 bits of that character's attribute byte.
 
     On the CGA and EGA, this function is valid for palette selection
     only in 320-by-200 4-color graphics modes.
 
     In 320-by-200 4-color graphics modes, if register Bh = 01h, the
     following palettes may be selected:
 
     Palette     Pixel value     Color
 
     0           0               Same as background
                 1               Green
                 2               Red
                 3               Brown or yellow
     1           0               Same as background
                 1               Cyan
                 2               Magenta
                 3               White
 
     On the CGA in 640-by-200 2-color graphics mode, the background
     color selected with this function actually controls the display
     color for nonzero pixels; zero pixels are always displayed as
     black.
 
     On the PCjr in 640-by-200 2-color graphics mode, if Bh = 00h and
     bit 0 of register BL is cleared, pixel value 1 is displayed as
     white; if bit 0 is set, pixel value 1 is displayed as black.
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