Brought a smile to my face. I see this as a shibboleth for the oldschool coders.
For those missing the joke, that's the assembly language commands to switch to VGA mode from DOS. Set AX register to 13 hex and call interrupt 10. That gives us VGA graphics mode 320x200 pixels!
Related: In the 1990s Michael Abrash via Dr. Dobbs Magazine, introduced the world to "Mode X" @ 320x240, which had the advantage of square pixels. That series of articles was responsible for my long-standing subscriptions to Dr Dobbs Journal.
320x240 was one of the benefits, but the more important part was that it allowed you to use all the memory, double buffer, use split screens (for HUDs) etc.
Addressing became more complicated, though. (And IIRC, Doom ran in 320x200 Mode X, for some design/monitor reasons)
Along with this interesting explanation https://meatfighter.com/puls/ of what's happening with the "binary-search" raytracing, lattice-effect, and tricks to make it fit in 256b.
For those missing the joke, that's the assembly language commands to switch to VGA mode from DOS. Set AX register to 13 hex and call interrupt 10. That gives us VGA graphics mode 320x200 pixels! Related: In the 1990s Michael Abrash via Dr. Dobbs Magazine, introduced the world to "Mode X" @ 320x240, which had the advantage of square pixels. That series of articles was responsible for my long-standing subscriptions to Dr Dobbs Journal.