Do you own a regular mini-dv camera, as well?
You can connect the yellow/red/white jacks on the Hi-8 to a mini-dv camera, with a specific cable. (I forget what it's called).
Play the Hi-8 while recording on the mini-dv camera. (Same way you'd record from your VCR or television)
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Or (as someone mentioned), get your mitts on a Digital-8 camera. Digital-8 will play Hi-8 tapes just fine, and it connects via FireWire direct to your computer.