INT 10 - VIDEO - WRITE GRAPHICS PIXEL
AH = 0Ch
BH = page number
AL = pixel color (if bit 7 set, value is xor'ed onto screen)
CX = column
DX = row
Notes:  valid only in graphics modes
BH is ignored if the current video mode supports only one page
SeeAlso: AH=46h

See also: 100D

100C - VIDEO - WRITE GRAPHICS PIXEL