those large solder pads are only used on 7x00 PowerMacs that have composite and S-Video in/out. They used the same motherboard as the 8500.

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I thought it was the other way around: the 8500 had the extra ICs to drive the composite video out. C- and S-video out was only available on the 8[56]00 and not available on the 7[56]00. The 7x00 and 8x00 both allowed video input, however.

This could also be a 7300 motherboard (which didn't support AV at all), and it is conspicuously missing the header for the AV module's ribbon cable. I vote 7300.

Peace,

Drew