[HECnet] Re: What are your DAP flag bit definitions?

My apologies; as I've said, this is not my normal area.  I'm just trying to keep the sparks from flying out of Tops-20 DAP, but I'm a Galaxy nurd; DECnet was somebody else's purview at Columbia. It's a shame the final code as shipped for Tops-20 V7 wasn't fully productized.  At one point, they were really doing it right.  I mean /really/ great.  The version 21 DECnet SWS Kit (BB-H348C-RM_1982) is just chock full of goodies to do regression testing and lots of additional documentation.  Highly recommended!  I'm going to run some of them at some point, they go against RSX, RSTS, Etc. Having whined about that, let me see if I can't do a better job. Here is a table with the _exact_ correspondence between the language on page 16 of DAP V5.6, by column: 1. The bit as defined in DAP V5.6, 2. The DAP language that defines it, 3. Some additional explanation from DAP V5.6 (or my interpretation  thereof), 4. The corresponding PDP-10 bit, 5. The Tops-10 symbol (which were all defined correctly), 6. The Tops-20 symbol I am using in DAPLIB (some of which were incorrectly defined) and 7. What I'm having DAPLIB print when in debugging mode for the PDP-10 bit DAP Bit DAP V5.6 Language Addition Information PDP-10 Bit Tops-10 DAP Symbol Tops-20 DAP Symbol Tops-20 DAP Message 0 Stream Identification field present Means doing multiple streams on the same link 1B35 DF$SID HD$SID SID 1 Length field present Denotes the lengthofthe OPERANDfield(numberof 8-bit bytes) 1B34 DF$HLN HD$LEN LEN 2 If bit 1(length fieldpresent) is set, fieldLEN256 is present and the length field is in effect 2 bytes long. Allows 64K message 1B33 DF$HL2 HD$LN2 LEN256 3 The BITCNT field is present Number of unused bits in final message.Useful for variable byte size files. 1B32 DF$BCT HD$BCT BITCNT 4 Reserved (0) Means don't use this bit. 1B31 DF$XX1 HD$RSV *RESV* 5 SYSPEC field present This optional field is the system specific field which means that it can only be used for file access between two homogeneous systems. 1B30 DF$SHX HD$SHX SYSPEC 6 If set, this is a segmented message and this is not the last segment of the message.The next message will contain the next segment of the full message. Means more data is coming for this segment. 1B29 DF$MOR HD$SEG SEG Is this better?  What I'm saying is: 1. I'm seeing DAP bit 4 getting set and I thought it wasn't supposed to be set, *ever*. 2. I'm also seeing bit 9 get set, which isn't defined. Do these reworded questions make sense now? I'll see about getting a tcpdump or wireshark or something.