You can try the software from Miglia and see if that recognizes it. The company who originally wrote the software (Televideo), allowed third-party cards to be used, as long as you paid for the software.
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You will need a serial for the Miglia software, but you should be able to install the software first and see if it recognizes your card. Also, there were some open sourced software projects out there a while ago for PCI TV cards, but most development ended well before a 1.0 release, right about the time of Mac OS X 10.2.7. You could try them out.
Nec dv-5800a driver for mac. In the nec dv-5800a case, you only need to launch the dvv-5800a file, while the second dv-5800a allows you to unpack it and follow the instruction included in the archive. Answered on Oct 09, Try going to device manager, and uninstall the optical drive.

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One was called iTV and the other was Xtelevision. There is supposedly pretty decent software available for digital tuner cards as well.
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And since your card is pretty common, you might want to try the Formac beta software if it is still available.