INT 10H 0cH: Write Graphics Pixel
Expects: AH 0cH
AL color number (+80H means XOR with current value)
BH video page (0-based)
CX graphics column
DX graphics row
Info: Even on the FASTEST computers, this fn is WAY TOO SLOW to expect
to get any reasonable amount of drawing done.
The BIOS does not support line-drawing or other standard graphics
primitives. To draw graphics with reasonable speed, you must
access video memory directly. See Video Memory Layouts.
Notes: When you add 80H to the color value in AL, the specified color is
XORed with the color that is currently at that position. That is
a useful graphics operation since XORing the same value twice
ends up with the original value.
See Also: INT 10H 0dH (read graphics pixel)
INT 10H: Video Services