10 Dec
2021
10 Dec
'21
10:03 p.m.
Thanks - this old thread on comp.os.vms says DDCMP is VAX only. If it
didn't make it to Alpha then I doubt it made it to Itanium but it can't
hurt to try.
https://groups.google.com/g/comp.os.vms/c/TcbXQkCFd8s
The OpenVMS 8.4 manual implies SLIP would work, though. Could I do
something with that?
"SLIP includes CSLIP (compressed SLIP). You can use any standard OpenVMS
terminal device as a PPP or SLIP line. (PPP is available for OpenVMS Alpha
systems only.)"
On Fri, Dec 10, 2021 at 3:36 PM Paul Koning <paulkoning at comcast.net> wrote:
On Dec 10, 2021, at 3:29 PM, Thomas DeBellis
<tommytimesharing at gmail.com>
wrote:
I know VMS at least did some kind of line. Columbia's chemistry
department
got a VAX before the campus Ethernet existed, so that wouldn't
have been an option.
However, I can't remember whether it was a synchronous or asynchronous
connection; only that the 'wire' went into one of our DN20's (I think
CU20B). I think the 'wire' had modems on both sides, but I can't remember
what those were, either.
The mainstream comm link before Ethernet was the DMC-11 or DMR-11. Async
DDCMP is a low cost alternative (with lower performance). You'd tend to
find it in embedded applications, which is why it's a key part of RSX. And
it appears in devices like the VT71 typesetting terminal.
RSTS/E did not do async DDCMP for a long time; I added it at some point to
get DECnet onto the Pro. That was unofficial; in V10.1 it became part of
the regular release but even there it is a bit clunky and not quite
complete. But it's enough that you can get DECnet/E to use a terminal line.
paul