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Hello Paul,
I use a Canopus ADVC55 firewire frame grabber, which at AUD350 ain't cheap, but it is good for the job. It digitises at 784 x 576 rather than 640 x 480 so I get a few extra pixels for the effort. It's bus powered so there is no need for another power cable. It also does not consume much in the way of processor cycles, as firewire is arbitrated on chip rather than by the processor.
Regards,
Tony Barry
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