[X4U] Scan negatives

[Paul Moortgat]

I've a Nikon Coolscan IV ED to scan my B&W negatives from 40 year ago.
But I've problems to determine if it's worth to scan or not just by seeing at it.
Isn't there a device to see the negatives in the positive way?
I can't make contact prints because I stopped developing them years ago.
It takes such a long time to scan a negative.  Then I know if it's OK or not.
Was it moved or out of focus?

Paul Moortgat