According to the JVC support area,
there are lots of "GR-DVX" camcorders and no manuals available for download... but I got one here
And yes, indeed, that camcorder's got no DV connector - but does have a "JLIP" connector which is no longer supported. Assuming the video was captured to the miniDV tape in SP mode, you *could* get a miniDV tape based camcorder or deck that does have a firewire port...
The other option is to get an "analog/digital converter". Use the analog AV-out RCA jacks you normally use to connect the camcorder to a TV, but instead of connecting to the TV, connect the camcorder to the A/D converter. Then the A/D converter connects to the computer. Depending on the converter, either USB or firewire is used to connect the converter to the computer. The video quality of the USB units is not so good - Roxio, Hauppage and Pinnacle Dazzle are examples The firewire converters can provide pretty good (Canopus ADVC55 at the low end) quality.
I did see that the manual's cover and the specification page 81 indicate the GR-DVX is a PAL video format. If you go with a miniDV tape based camcorder, be sure it is PAL. NTSC camcorders will not work with the PAL encoded video. As well, be sure the A/D converter can deal with PAL...
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