[kookamamie]

Nice. Except that Mode X was not usually called 13h. The former would be 320x240 and the latter 320x200. Technically X would be a variant of the 13h, though.

[ale42]

And actually, INT 13h is the BIOS interrupt to access block-based disk I/O functions (like sector read, track format, etc.). The INT used for mode-setting is 10h (with AH=00h and AL=13h as mode for 320x200 at 256 colors).

[gneissguise]

Thank you both for the corrections, I was a teen in the 90s so I could have had it wrong or misremembered.

I just looked up the 13h interrupt and you are absolutely right!

[kookamamie]

An awesome contribution nevertheless!

[gneissguise]

Thank you!