🚀 go-pugleaf

  Can someone tell me which - if any - document(s) (IBM or otherwise)
  explain the innards of DLC protocol?  SNA frames in general?

  I have a couple documents which help some, the 3174 Functional
  Description [June 1991] and the SNA Reference Summary Booklet.
  (I'm not sure of the exact names right now but these are close).
  These books help some, especially the latter.  It has the general
  breakdown of the TH, RH, & RU as well as excruciating detail of the
  SNA & DLC commands.

  There is an awful lot in both these documents but I have come
  across some things in writing, modifying, and testing 3174 controller
  code that I can't seem to find the answers to.  Some of these are:
  What do I screw up if I accidentally send the host two consecutive
  NOTIFYs?  In this case, is the reception of a sense message good
  enough to continue or am I hosed up from then on?  (I. e, pending
  my fixing that particular problem, is the rest of what I see okay?)
  What do I do if the reserved bit of byte0 of the RH is set sometimes
  and not others?  What exactly is the meaning of the DR1 bit?
  There are more.

  I have found many answers by just asking people I work with.
  But when I ask where anyone ever found these things out, they
  ALWAYS say "I don't remember" or "Someone told me that once."

  For that matter, does anyone know where I can find a state
  machine/graph/chart/whatever of what is to be returned to
  the host depending what is received in whatever mode?  (For
  example, an ACTLU in NRM).

  I have no problem getting my employer to order what I need if I
  can just find out what would help the most.  As most people know,
  the list of IBM manuals - even for the most narrow subject - is huge!
  Maybe there are a couple manuals I have missed that have fallen
  through the cracks that would fit the bill.

  Can anyone help?

  Thanks!

 |__________________________|______________________________________|
 | Bob Campbell             |                                      |
 | bc@campbell.Gwinnett.COM | "Think not of the hours wasted...    |
 | ...!emory!gwinnett!bc    |  but of all yet to be tasted."       |
 |__________________________|______________________________________|