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<p>The CI interface is the KLIPA. Its a KL10-only device that sits
in an RH20 channel slot. It uses a port architecture similar to
the CI780, with queues and 36-bit pointers in physical memory.
It's supported in 7.04.</p>
<p>With respect to an earlier question about CI emulation: The best
approach may be to emulate it as multicast ethernet. Setup a
couple of groups for each star coupler. Each coupler supports up
to 32 nodes. For VMS, half o them hosts, half storage. CI is a
50Mb/s (might be 70, but I remember 50 from the initial doc)
CSMA/CD bus. The cabling is redundant (A & B cables), so
assign one MC group to each per star. (Yes, there are DECnet
drivers for on multiple OSs. I think it was considered a
multipoint medium with addresses related to (CI) node numbers
rather than an ethernet (broadcast) - but it's been a while.)</p>
<p><br>
</p>
<p>Have fun.<br>
</p>
On 09-Mar-17 11:58, Tim Stark wrote:<br>
<blockquote cite="mid:000301d298f6$63956e80$2ac04b80$@verizon.net"
type="cite">
<pre wrap="">Folks,
Hmm. I checked TOPS-10 7.04 monitor source codes and found two files about SCS/SCA packet info but did not find any files about CI interface.
I think TOPS-10 can communicate through DECnet.
I think that transport layers are SCS/SCA layers.
There is commercial emulator (Charon-VAX) emulates CI hardware and HSJ50 controllers. They are much faster than actual CI hardware.
So that we can implement them on SIMH and other emulators possibly.
Tim
-----Original Message-----
From: Simh [<a class="moz-txt-link-freetext" href="mailto:simh-bounces@trailing-edge.com">mailto:simh-bounces@trailing-edge.com</a>] On Behalf Of Rich Alderson
Sent: Tuesday, March 7, 2017 2:37 PM
To: <a class="moz-txt-link-abbreviated" href="mailto:simh@trailing-edge.com">simh@trailing-edge.com</a>
Subject: Re: [Simh] CI750 tech docs and VAX firmware
</pre>
<blockquote type="cite">
<pre wrap="">Unless I remember totally wrong, only the HSC50 could do 576 byte sectors.
It was dropped in a pretty early version of CRONIC, before support for
any other HSC controller existed.
</pre>
</blockquote>
<pre wrap="">
Correct. Only the HSC50 ever supported 576-byte sectors, and only on RA81 and smaller drives. (We really wanted RA82s on our 4-system CI cluster at Stanford LOTS, but were informed that it would never ever happen.)
Rich _______________________________________________
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</pre>
</blockquote>
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