I'm having trouble finding the proper analog to digital cable...?

I'm coming up on trying to produce a full length film and while I have the equipment to edit manually, i would much rather be able to edit on my computer. The problem here is that i have an older camcorder (1997) so it doesn't really play that game well. I have a Sony Handycam Vision, model number TRV52NTSC and I want a cable that would be RCA to a USB port or something similar to that. Where can I find such a thing?
 
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