PMIFI256.COM
PC Speaker bytebeat + Textmode
Plasmifier cover 256B by TomCat/Abaddon
the original 1k intro by FruitieX

The best way
to listen to this intro
run it under FreeDOS
on machine with a real speaker
(not with a piezo buzzer),
to stream this intro
use a very sensitive microphone
in a silent enviroment.