it’s hard to remember
At least 2
a soundblaster and a graphics card.
After that, I can’t remember whether a card was needed for the first CD players.
The first x86 IBM had no hard drive, 2 floppy disks. If you were lucky enough to have one, it was 5 to 10mo capacity. It took 20 minutes to format.
A word was on a floppy disk.
Some other time...