0xb800 is the address of the framebuffer for text. Simply write characters to that address, using offset `((row * width) + col)` and they'll appear on screen.

0xb800 is the address of the framebuffer for text. Simply write characters to that address, using offset `((row * width) + col)` and they'll appear on screen. In graphics mode it was, IIRC, 0xa000. I once wrote a pacman-type easter egg inside the point-of-sale system[1], because doing direct graphics straight to an address is so easy and simple. [1] Was removed after pilot and before actual release.