🚀 go-pugleaf

For information on LU-6.2 (a.k.a., APPC), I recommend the following IBM
publications (in this order):

    SC26-4399, "SAA CPI: Communications Reference"

         Describes the interface between an application program and the
         end of an LU-6.2 session -- the "Application Programming
         Interface" (API).  It also describes in high-level terms what is
         actually happening on the session.  This tells you how to use
         LU-6.2 communications, assuming that someone else has
         implemented it.  A well-written manual.

    GC30-3084, "SNA Transaction Programmer's Reference Manual for LU-6.2"

         Similar to SC26-4399, although with a lot more detail and
         including some stuff that hasn't been mapped into SAA.

    SC31-6808, "SNA LU-6.2 Reference: Peer Protocols"

         All the grubby details that one needs to actually implement
         LU-6.2 in a "peer" (PU-2.1) node.  A rather large tome.

    SC30-3269, "SNA FAP: Architecture Logic for LU Type 6.2"

         The 6.2-specific stuff here is slightly out-of-date as compared
         with SC31-6808 (which is the "official" reference); however,
         this includes additional information that you need to implement
         LU-6.2 in an SNA subarea node (PU-4 and/or PU-5).

    SC30-3422, "SNA Type 2.1 Node Reference"

         Information on how to implement a PU-2.1 node (the stuff that
         roughly corresponds to OSI Layers 3 and 4).  A bit on the
         sketchy side.

I don't know of any (non-IBM) books that include any significant material
on LU-6.2, although some surely exist...

      John Pershing
      IBM Research, Yorktown Heights