hp5p scsi cable

[Adam Myrow]

The other common connector is 25 pins.  That one is easy to tell, because
it's the exact same size and shape as a parallel port connector.  If you
aren't paying attention, it will happily fit right into a computer's
parallel port.  Of course, it isn't all that useful like that, but I've
messed up a few times with mine and put it in the parallel port by
mistake.  So, if it fits the parallel port, it's 25 pins.  If it's a lot
wider, it's the 50-pin variety.