Two canon cameras but only one shows an image

The camera hooked up to FireWire, not through the adapter, shows an image, but the other doesn’t. Is it a problem to mix camera types? One is an hv20, the other is an XL1.

Figured it out. Needed to switch the HV20 to DV mode and all was good.

I paused a recording not realizing it would want to process the file. I had to stop it. Is that file lost now?