Whether or not p_ is to be considered an authentic Aramaic conjunction or not (as opposed to the ubiquitous by-form ˀp, ˀwp) is uncertain. In OA texts from Sam'al it is surely a Samalian usage, while in the Middle Aramaic monumental dialects and Samaritan it reflects the common Arabic conjunction. Note that in those texts it reflects the Arabic semantics as opposed to the simple conjunctive waw.
Page refs. in other dictionaries: Tal Sam: 671DNWSI: 898f