ESPN Classics just televised the 1983/09/09 Arguello-Pryor bout:
http://www.boxrec.com/date_search.php?y ... &SUBMIT=Go
It looked like a KO to me--Arguello was counted out, wasn't he? While he sat on the floor? And the ring announcer said it was a KO. Was it officially declared a TKO? We have it recorded as a TKO for some reason.