If you have a computer with a standard soundcard with an 1/8" line in you can just plug in from the cassette deck using a rca to 1/8" stereo adapter. a couple of bucks, and don't have to use usb.
If you have to use usb due to using a laptop that only has a mono mic input you'll need an interface that adapts the rca to usb. The cheapest, basic one I've seen are about 40 bucks.

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