Everyone use to go on about Anticon etc being ‘nerd rap’.
But the real nerd rap starts way earlier . . . . Browsing the Internet Archive I chanced upon this, a 9 minute anti-piracy short from the mid 80s called Don’t Copy That Floppy. Its has a certain ‘old world charm’.
It contrasts nicely with the 3l33t speak of YT Cracker.