sata adapter

Greetings all;

I have a nearly 30 year old computer that has an aftermarket scsi adapter 
plugged into it.  Unforch the scsi2 drives I have are suffering from 
stiction and will only start if given a tap sufficient to break the seal 
between the disks and the heads.

So, what I am looking for is a scsi2 (50 pin) adapter so I can use a more 
modern sata drive on it.

Is there such a beast, and if so, where can I buy it in the US?

Thanks & Cheers, Gene
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