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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>L.S.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Almost good:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>In the Anf10 source listings the following:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=Default><b><span style='font-size:8.5pt'>DN200 - DECSYSTEM-10 REMOTE STATION MACDLX V31 11-AUG-120 20:31 PAGE 227-1 </span></b><span style='font-size:8.5pt'><o:p></o:p></span></p><p class=Default><b><span style='font-size:8.5pt'>DNDCMP.P11 16-FEB-88 07:57 LINK DOWN <o:p></o:p></span></b></p><p class=Default><span style='font-size:8.5pt'><o:p> </o:p></span></p><p class=Default><b><span style='font-size:8.5pt'>9934 ;*** ALTHOUGH THERE IS NOTHING REALLY IN THE DDCMP SPEC TO PROHIBIT SIMPLY <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9935 ;*** STARTING OFF WITH WILD AND WIERD NUMBERS, SOME LESS-THAN-ROBUST SYSTEMS <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9936 ;*** TEND TO GET TERRIBLY CONFUSED IF THE FIRST DDCMP NUMBERED MESSAGE ISN'T <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9937 ;*** NUMBER "1", SO . . . RESET THE MESSAGE NUMBERS <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9938 ;*** MOVB LB.LAP(J),LB.HSN(J) ;HIGHEST PROC IS HIGHEST SENT <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9939 ;*** MOVB LB.HSN(J),LB.LAR(J) <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9940 035140 005065 000056 CLR LB.ROK(J) ;RESET MSG NUMBERS <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9941 035144 005065 000060 CLR LB.LAP(J) <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9942 <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9943 002 .IF NE FT.DDP <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9944 TST LB.ST2(J) ;<u>IS THIS A DDP-CONTROLLED LINE?</u> <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9945 BPL 40$ ;NO, DO NCL'ISH STUFF <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9946 MOV J,-(P) ;YES, SAVE LBLK ADDRESS <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9947 MOV LB.DDB(J),J ;CONTEXT SWITCH TO DDP DEVICE LEVEL <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9948 JSR PC,DDPOFL ;SAY THE DDP DEVICE IS "OFFLINE" <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9949 MOV (P)+,J ;RESTORE DDB ADDRESS <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>9950 RTS PC ;NOTHING MORE TO DO <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:8.5pt;font-family:"Courier New";color:black'>9951 001 .ENDC ;.IF NE FT.DDP<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:8.5pt;font-family:"Courier New";color:black'><o:p> </o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>DN200 - DECSYSTEM-10 REMOTE STATION MACDLX V31 11-AUG-120 20:31 PAGE 230 <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>DNDCMP.P11 16-FEB-88 07:57 DDPSER - DDP DEVICE SERVICE ROUTINES <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10058 .SBTTL DDPSER - DDP DEVICE SERVICE ROUTINES <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10059 <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10060 001 .IF NE FT.DDP <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10061 002 .IF NE DDPN <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10062 <o:p></o:p></span></b></p><p class=Default><b><u><span style='font-size:8.5pt'>10063 ;THE DDP DEVICE ALLOWS THE VARIOUS DDCMP LINES TO BE USED AS DIRECT I/O <o:p></o:p></span></u></b></p><p class=Default><b><u><span style='font-size:8.5pt'>10064 ;DEVICES RATHER THAN AS NCL (OR NSP) NETWORK COMM LINES. <o:p></o:p></span></u></b></p><p class=Default><b><span style='font-size:8.5pt'>10065 <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10066 ;DDP DEVICE PARAMETERS SETTABLE ON A "PER-LINE" BASIS <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10067 ; <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10068 ; DPnnWID ;"RECORD SIZE" OR MESSAGE SIZE <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10069 ; DPnnCHK ;CHUNKS-PER-DATAREQUEST WEIGHTING <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10070 ; DPnnRNN ;RESTRICTED HOST ASSIGNMENT <o:p></o:p></span></b></p><p class=Default><b><span style='font-size:8.5pt'>10071 ; DPnnPFH ;PREFERRED HOST ASSIGNMENT <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:8.5pt;font-family:"Courier New";color:black'>10072<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It is for an Anf10 ddcmp device on a Pdp11/34 DN200 Anf10 workstation which might also have been (projected to?) made use of in a 2020 system.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Anf10 runs on simh Pdp11/34 with some fiddling of the emulation speed.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>R.V.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> owner-hecnet@Update.UU.SE [mailto:owner-hecnet@Update.UU.SE] <b>On Behalf Of </b>Peter Lothberg<br><b>Sent:</b> Sunday, 17 January, 2021 23:29<br><b>To:</b> hecnet <hecnet@Update.UU.SE><br><b>Subject:</b> Re: [HECnet] Thousands of DECnet errors on Tops-20<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>A DDP device is a "DDCMP speaker on a ANF10 front end". <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>It's basically a 576 byte card punch/reader on the front end with corresponding<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>device on the T10 side. We used it on the KI to talk both DECnet-IV and IP (to <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>a BSD 4.3 vaxen with a DMR-11.) It was done as a hack by Robert Hauk, who<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>also put in ANF10 over Ethernet. (remmember the DECnet frontend for the DTE<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>was only phase 3).<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>Dept of useless knowledge..<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>-P<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div class=MsoNormal align=center style='text-align:center'><span style='font-family:"Arial",sans-serif;color:black'><hr size=2 width="100%" align=center id=zwchr></span></div><div><blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0cm 0cm 0cm 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><b><span style='font-family:"Helvetica",sans-serif;color:black'>From: </span></b><span style='font-family:"Helvetica",sans-serif;color:black'>"tommytimesharing" <<a href="mailto:tommytimesharing@gmail.com">tommytimesharing@gmail.com</a>><br><b>To: </b>"hecnet" <<a href="mailto:hecnet@Update.UU.SE">hecnet@Update.UU.SE</a>><br><b>Sent: </b>Sunday, January 17, 2021 5:10:08 PM<br><b>Subject: </b>Re: [HECnet] Thousands of DECnet errors on Tops-20<o:p></o:p></span></p></blockquote></div><div><blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0cm 0cm 0cm 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'><p><span style='font-family:"Helvetica",sans-serif;color:black'>The only serial lines that I saw DECnet running on were synchronous connections. The local connections between CU's 20's (before we got the CI's and NI's) were 56K baud synchronous lines running on KMC11's, which we thought were pretty hot stuff ...until... Non-data center connections (our chemistry VAX, CMU & CWR 20's) were asynchronous lines running 9.6K baud (on DUP11's, I think).<o:p></o:p></span></p><p><span style='font-family:"Helvetica",sans-serif;color:black'>The PANDA monitor's Multinet code implements serial IP (SLIP), which it will run over an ordinary DL or DH based asynchronous lines. I didn't immediately see anything similar for DECnet, but it is doubtful that MRC would have put that it in; the code was supposed to run on a 2020, which has different IO drivers. If his 2020 5.0 changes ever do surface, it may be conceivable that some of them might be retrofitted into 7.1 (depends on what's applicable).<o:p></o:p></span></p><p><span style='font-family:"Helvetica",sans-serif;color:black'>It is now possible that I will eventually figure out what this mysterious DDP device is. I reconfigured both 20's to have the largest buffer possible (</span><tt><span style='font-size:10.0pt;color:black'>DECNET BUFFER-SIZE 1476</span></tt><span style='font-family:"Helvetica",sans-serif;color:black'> in </span><tt><span style='font-size:10.0pt;color:black'>SYSTEM:7-1-CONFIG.CMD</span></tt><span style='font-family:"Helvetica",sans-serif;color:black'>, which I checked in the running monitor), rebooted <i>and</i> ... I'm still getting the same frame too long error, viz:<o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p><tt><span style='font-size:10.0pt;color:black'>***********************************************</span></tt><span style='font-size:10.0pt;font-family:"Courier New";color:black'><br><tt>DECNET ENTRY</tt><br><tt> LOGGED ON 16-Jan-2021 01:29:38-EST MONITOR UPTIME WAS 0 day(s) 0:16:8</tt><br><tt> DETECTED ON SYSTEM # 3691.</tt><br><tt> RECORD SEQUENCE NUMBER: 35752.</tt><br><tt>***********************************************</tt><br><tt>DECNET Event type 5.15, Receive failed</tt><br><tt>From node 2.522 (VENTI2), occurred 16-JAN-2021 01:29:11</tt><br><br><tt> Line NI-0-0</tt><br><br><tt> Failure reason = Frame too long</tt><br><tt> Ethernet header = AB 00 00 03 00 00 / AA 00 04 00 08 0A</tt><br><br><tt>***********************************************</tt><br><tt>DECNET ENTRY</tt><br><tt> LOGGED ON 16-Jan-2021 01:29:38-EST MONITOR UPTIME WAS 0 day(s) 0:16:8</tt><br><tt> DETECTED ON SYSTEM # 3691.</tt><br><tt> RECORD SEQUENCE NUMBER: 35753.</tt><br><tt>***********************************************</tt><br><tt>DECNET Event type 5.15, Receive failed</tt><br><tt>From node 2.522 (VENTI2), occurred 16-JAN-2021 01:29:28</tt><br><br><tt> Line NI-0-0</tt><br><br><tt> Failure reason = Frame too long</tt><br><tt> Ethernet header = AB 00 00 03 00 00 / AA 00 04 00 FF 0B</tt><br><br><tt>************************************************************************</tt></span><span style='font-family:"Helvetica",sans-serif;color:black'><o:p></o:p></span></p></blockquote><p><span style='font-family:"Helvetica",sans-serif;color:black'>Darn it‼️ So now I've got some modifications to actually make to the monitor to give some better error information (like the number of bytes overrun, if I can extract it). So maybe I'll stumble over whatever DDP does. It's odd; I can't think of any device that a pack of KL's could share except something like a dual ported disk or magnetic tape drive and that's only two KL's.<o:p></o:p></span></p><p><span style='font-family:"Helvetica",sans-serif;color:black'>Meanwhile, I'll also do a </span><tt><span style='font-size:10.0pt;color:black'>tcpdump</span></tt><span style='font-family:"Helvetica",sans-serif;color:black'> so I can try to correlate what Tops-20 is silently whining about with what's coming over the bridge.<o:p></o:p></span></p><p><span style='font-family:"Helvetica",sans-serif;color:black'>Finally, something to beware of if you are running the KLH10 micro-engine and have a very large file that you're backing up (you're all running regular backups, <i>right</i>?) The amount of disk activity will somehow prevent KLH10's front end timer from popping so, unless you are running my changes to DTESRV, you're going to <i>hang</i> with a </span><tt><span style='font-size:10.0pt;color:black'>DTEKPA</span></tt><span style='font-family:"Helvetica",sans-serif;color:black'> </span><tt><span style='font-size:10.0pt;color:black'>BUGINF</span></tt><span style='font-family:"Helvetica",sans-serif;color:black'>. A quick hack is to deposit a -1 into </span><tt><span style='font-size:10.0pt;color:black'>FEDBSW</span></tt><span style='font-family:"Helvetica",sans-serif;color:black'>, which will keep the 20 from trying to reboot the front end (which KLH10 absolutely does not know how to handle). <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-family:"Helvetica",sans-serif;color:black'>So the quarterly full backups worked fine on the development machine (VENTI2) which has the patch, but not on the production machine (TOMMYT) which does not. Pity, I had been up over 32 weeks and was only a little short of 3,000 hours uptime.<o:p></o:p></span></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div class=MsoNormal align=center style='text-align:center'><span style='font-family:"Helvetica",sans-serif;color:black'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><span style='font-family:"Helvetica",sans-serif;color:black'>On 1/15/21 11:58 PM, Johnny Billquist wrote:<br><br>I saw that and wondered as well. <br>I was thinking maybe it could be for DDCMP devices without more specifically defining what it would be, since DDCMP could be run over any serial line? <br><br> Johnny <o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div class=MsoNormal align=center style='text-align:center'><span style='font-family:"Helvetica",sans-serif;color:black'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><span style='font-family:"Helvetica",sans-serif;color:black'>On 2021-01-15 22:53, Peter Lothberg wrote: <br><br>The 2020 has a KMC11 and up to 2 DUP11, and those are the interfaces <br>the "MRC T20 DECnet thing supports. <br><br>On the list of devices/sizes you posted is a "DDP" device and I wounder if you knew what that is? <br><br>--P <o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div class=MsoNormal align=center style='text-align:center'><span style='font-family:"Helvetica",sans-serif;color:black'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><b><span style='font-family:"Helvetica",sans-serif;color:black'>From</span></b><span style='font-family:"Helvetica",sans-serif;color:black'>: "tommytimesharing" <a href="mailto:tommytimesharing@gmail.com" target="_blank"><tommytimesharing@gmail.com></a> <br><b>To</b>: "hecnet" <a href="mailto:hecnet@Update.UU.SE" target="_blank"><hecnet@Update.UU.SE></a> <br><b>Sent</b>: *Friday, January 15, 2021 4:24:07 PM <br><b>Subject</b>: *Re: [HECnet] Thousands of DECnet errors on Tops-20 <br><br> DDP? I thought it was DUP-11. <o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div class=MsoNormal align=center style='text-align:center'><span style='font-family:"Helvetica",sans-serif;color:black'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><span style='font-family:"Helvetica",sans-serif;color:black'><br>On 1/15/21 4:21 PM, Peter Lothberg wrote: <br><br>Well, MRC was receiving "suggestions" from Stu Grossman on how to do it, but if my memory does not fail me the block size was 312, due to lack of buffer space in the already crammed single section 512KW 2020. I'm afraid my tape and disk-pack are in Seattle. I knew it was not 576 as it had two DUP-11's and using it for transit failed... <br><br>Quiz, do you knew what a DDP is? <br><br>-P <o:p></o:p></span></p></blockquote></blockquote></blockquote></blockquote><p class=MsoNormal><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></blockquote></div></div></div></body></html>