From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :
SPX Sequenced Packet eXchange (Novell, Netware)From The Free On-line Dictionary of Computing (30 December 2018) :
SPX 1.From The Free On-line Dictionary of Computing (30 December 2018) :Sequenced Packet Exchange. 2. A graphics program for the Atari microcomputer. ftp://src.doc.ic.ac.uk/computing/systems/atari/umich/Graphics/spx_v18.lzh)">(ftp://src.doc.ic.ac.uk/computing/systems/atari/umich/Graphics/spx_v18.lzh). 3. Simplex. (1997-03-04)
spxThe filename extension for Screen Peace eXtension files. (1995-03-14)