Well a 25-pin D-sub connector on the parallel side and a Centronics SCSI connector on the other end, but this makes a bulky door stop; a nice red brick is more compact.
There is no way a parallel port can drive a SCSI device, and if by magic it did, it would be slower than molasses in winter. There were slow Zip drives and the like that were made to work with the parallel port for laptops, but that was not a SCSI connection.