Not graphics, but even the PC speaker intro had some significant effort put into it, considering how limited it was as a sound source.
Having grown up gaming on PC speaker I only knew the wavetable MIDI miracles from hearsay. Now any time I touch some DOSbox retro memory I'm nothing but disappointed becausr those MIDI tunes? They are just that, tinny voyages through the general MIDI instrument set where well made PC speaker programming can have awesome roughness.
Hearing the Monkey Island theme played how it would have been on a high end sound card is crazy. PC speakers did their best but it was composed as a damn symphony.
https://youtu.be/a324ykKV-7Y?is=Dn0qcERhEasBjloQ