<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">As Clem notes, the 1822 report defines three types of Host to IMP interfaces, Local Host, Distant Host, and Very Distant Host.<div class=""><br class=""></div><div class="">The Local host uses TTL levels to signal, with per-bit handshaking. The Distant Host</div><div class="">uses, IIRC, differential signalling aomewhat like RS422 electrically, but uses the per-bit handshaking.</div><div class="">The VDH, on the other hand, is more like the IMP to IMP protocol which is actually BISYNC at the wire level.</div><div class="">This can be done with any synchronous serial line adapter on the host (no start and stop bits!). So if there are any SIMH synchronous serial controllers, they would work for VDH. The DU-11 maybe ?</div><div class=""><br class=""></div><div class="">At SU-ISL we ran VDH from an 11 to the IMP at the Stanford Medical School (SUMEX-AIM).</div><div class=""><br class=""></div><div class="">The software for VDH is messier than for LH or DH though, because there is a BISYNC layer for framing and a link ARQ scheme for error detection and retransmission of packet fragments across the (not assumed error free) VDH link.</div><div class=""><br class=""></div><div class="">So there were 11’s with VDH. I don’t know if any 10’s used them, so that the VDH software would exist.</div><div class=""><br class=""></div><div class="">-Larry</div><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On 2016, Feb 29, at 3:48 PM, Clem Cole <<a href="mailto:clemc@ccc.com" class="">clemc@ccc.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Tim I'm going to guess that the AN22 implements the PDP-10 side of the BBN 1822 IMP interface. Is that a correct belief?</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Bit Savers has the BBN 1822 document from 1976 (the original I think was '72 - I had a xerox of that one). I think I saw it about a week ago at home, so I'm nearly 100% sure I have very clean copy of the actual published in it's Yellow Cover from BBN, the later edition - which would have been the one when the IP transition was taking place or at least planned (i.e. post Arpanet - when IP was being created). If so, I'll look into getting it scanned and send an update to Al. I'm pretty sure there was changes when BBN implemented their own mini for the IMP (the C30 - which later got re-microcoded to be general purpose computer - the C70 "C Machine").</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"> </div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I do not remember how CMU interfaced the 10's and C.mmp to their (Honeywell) IMP. I suspect it was either something like the AN22 or be a Jim "Tetter Toy" that he cooked up (I never knew). However, IIRC @ UCB Ingres 11/70s a DR-11B with a little logic (??Bob Kriddle hack maybe?? - at one time I had my hand in it). That was the UCB Arpanet interface for many, many years --- until CSRG finally got a C30 IMP in Evans in the early 1980s. Ing70 had a "very long host" interface from a Honeywell IMP that was "up the hill" at LBL. Again, IIRC the C30 could do Ethernet to the Vaxen. Or maybe it was connected to the Ethernet via a C70 which was connected the C30 (I've forgotten). But until the C30 showed up, the UCB Arpanet/Internet connection was fairly shallow; unlike CMU, MIT or Stanford.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Clem</div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Mon, Feb 29, 2016 at 12:33 PM, Timothe Litt <span dir="ltr" class=""><<a href="mailto:litt@ieee.org" target="_blank" class="">litt@ieee.org</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000" class=""><div class=""><div class="h5">
On 29-Feb-16 12:34, <a href="mailto:b4@gewt.net" target="_blank" class="">b4@gewt.net</a> wrote:<br class="">
<blockquote type="cite" class="">
<div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;" class="">
<div class="">Hello,<br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Can anyone point me at IMP documentation for the KS10? I'm
only seeing AN10 maintenance printsets up on Bitsavers...I'd
love documentation that isn't KLH10's KS10-ITS implementation!<br class="">
<br class="">
</div>
<div class="">Alternatively, were any of the experimental Ethernet
interfaces ever supported in TOPS-10/20 on the KS10? (I don't
have access to my SRI-NIC packs due to the VM being down at
present)<br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Alternatively too...the userland ANF-10 bridge could prove
useful for this...<br class="">
</div>
</div>
<br class="">
</blockquote></div></div>
Not clear what you want to do.<br class="">
<br class="">
The KS does have an ARPA interface, the AN22. I have not tracked
down a spec for it. It is KMC-11 based, not simulated by SimH at
present. The TOPS-20 monitor sources for 4.1 are a resource. One
day I'll get access to my stuff at CHM and will look for a spec.
It's on my list to see if it's worth emulating.<br class="">
<br class="">
The DEUNA is simulated in SimH. Neither the released TOPS-10 nor
TOPS-20 support it. There is some TCP code floating around that
does.<br class="">
<br class="">
If you're trying to move files in and out:<br class="">
DECnet does work (phase II on TOPS-20, Phase III or IV on
TOPS-20), and will talk to VAX/RSX. You can move files by stopping
on or PMR thru) one of them.<br class="">
<br class="">
ANF-10 on the KS does work, KS-KS. It should be possible to build
the -11 nodes on the KS & boot them on a SimH -11. I've been
meaning to get around to that, but haven't. With ANF, besides the
peripherals and terminals, you get DCP.<br class="">
<br class="">
Networking on the KS is supported on both OSs by the KDP
emulator. The DMR should work, though I think there's a monitor bug
in 7.04 where my colleagues changed AC definitions and didn't update
the DMR driver. Also on my list.<br class="">
<br class="">
You can also move files in and out with Kermit (serial lines),
cards, magtape, printer.<br class="">
<br class="">
I don't know what you mean by 'anf-10 userland bridge'. Of course,
FAL on the -10 listens to both DECnet and ANF.<br class="">
<br class="">
</div>
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