In this tutorial I'll show you how to display and draw a pixel on the screen on 8086 Assembly, using the mode 13h and the 10h interruption.
In the following links there's more information about the interruptions used and the mode 13h color palette:
INT 10H: https://en.wikipedia.org/wiki/INT_10H
INT 16H: https://en.wikipedia.org/wiki/INT_16H
INT 21H: http://spike.scu.edu.au/~barry/interr...
MODE 13H: https://en.wikipedia.org/wiki/Mode_13h