On 2017-03-09 19:00, Paul Koning wrote:
On Mar 9, 2017, at 12:27 PM, Timothe Litt <l...@ieee.org> wrote:
..
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.
70 Mb/s is the number I always saw.
Me too.
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.)
I don't think DECnet ever supported CI. It certainly doesn't show up in the
DECnet architecture specs anywhere.
It did support it. But if I remember right, it was kindof not really
supported. The drivers existed, and was provided to customers, but I
think VMS manuals mentioned it as some unsupported lines. I remember
having tested it a little, and did get it to work.
Under Ultrix I also managed to get TCP/IP running over CI.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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