CS6: cable for capturing from a JVC camcorder

You must patch FireWire to FireWire.  

Does your computer have FireWire or Thunderbolt?  

The 4-pin FireWire connector on your camcorder would patch to a 9-pin FireWire800 connector on your computer.  Or, to a 9-pin FireWire to Thunderbolt2 adapter (only Apple makes this adapter).  That may then need to go Thunderbolt2 to Thunderbolt3 (another adapter).  It's also possible to go 4-pin to 6-pin (FireWire400) if 6-pin is available on the computer side.

PCI FireWire cards, assuming your computer as a PCI slot) are getting harder to find.

FireWire is the best way to transfer your DV-NTSC tapes to your computer, capturing at DV-NTSC settings in Premiere Pro.

FireWire was standard on many Mac computers.  You could pick up a used Mac mini or iMac from just about any year as long as it still boots up and use iMovie to capture your tapes, then move the resulting clips over to your current computer.  If the used Mac is new enough to run macOS 10.13 or newer, you can install Premiere Pro on it and use that to capture your tapes.  You'll need 13GB per hour of footage.  Capturing to a ExFAT formatted drive will make moving the files to your computer easy.  Of course, I'm assuming your on a Windows-based computer.  If the Mac is so new that it only has Thunderbolt, you'll need the corresponding FireWire to Thunderbolt adapter(s).

The DV cable is all you need. Premiere Pro gives you the option to capture only the video. You should check your settings.

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