My dad has a box of punchcards for code he wrote in his university class, well before ‘98. I think all of my own 90s era code was on floppy disks that may or may not still be readable.

I have a printout of a Pascal Othello/Reversi game I wrote in 1985 for a class, as well as some C and DCL stuff from 1986-1987. The oldest I still have online is some more C stuff from work in 1988.

I still have code I wrote for the C64 in 1988 lol.