Mode 13H was pretty nice. But mode 13X, hacked to have square pixels, was the coolest!

Mode X allowed pretty cool stuff, like fake true color with interlaced lines (R,G,B), double buffering etc!

Fond memories.

Here is a YouTube rendition of a demo I implemented in 96, showing those techniques https://m.youtube.com/watch?v=t8o-uuq73UU&pp=ygUQTmlra2kgaml...