31 Jan
2022
31 Jan
'22
8:48 p.m.
Paul Koning wrote ...
Correct, I was not aware it's possible to use it.
The only software I
have seen that uses the KG11 is 2780 emulation.
I am very interested in getting 2780 emulation for a PDP-11.
Paul, or anyone else, do you know where I can get it?
Cheers
Peter Allan
On Sun, 30 Jan 2022 at 18:31, Paul Koning <paulkoning(a)comcast.net> wrote:
>
>
> > On Jan 29, 2022, at 7:37 PM, Johnny Billquist <bqt(a)softjar.se> wrote:
> >
> > On 2022-01-30 01:04, R. Voorhorst wrote:
> >> L.S.
> >> With a bit time on hand and the standstill after Paul's initial test
> from
> >> dup to pydecnet which appeared to be successful, I now undertook a test
> as
> >> Mark liked to have it preferably.
> >> So I did a fresh netgen on a simple configuration from simple basic
> install
> >> Rsx11MP system for only a Decnet end-node with one single Dup line
> >> communicating to a known working Pdp11 Rsx11MP Dmc circuit.
> >> I saw no difference from what I reported initially and later with
> logging,
> >> as was to be expected; my complex setup behaves exactly the same in this
> >> respect as it does for years in a complex network setup for Rsx and
> Rsts,
> >> and RT11 without network.
> >> This is on a Windows-2008R2 server and I suspect Paul did his test on
> >> unix/linux , however although it differs, that should be moot as far as
> >> Simh is concerned.
> >> There could be another difference though. Paul would probably have
> taken the
> >> default route and used Ddcmp withouth KG11 support: Dup without Kdp is
> the
> >> only sync line to use it, though async Decnet DL/DZ/VH might use it as
> well.
> >> As I prefer the most complex configs possible (any two of a kind where
> >> possible as Dec used to have them), I do also employ the KG11, so for
> Dup
> >> support it will be used when configured so in Decnet11MP.
> >
> > I would suspect Paul did not run with KG11.
>
Correct, I was not aware it's possible to use it.
The only software I
> have seen that uses the KG11 is 2780 emulation.
>
> > I agree that the host system shouldn't make a difference.
>
> Not unless it's big endian, in which case getting this stuff to come out
> right requires some care.
>
> >> On a sim it is not that effective, but in hardware in the past it did
> make a
> >> difference for fast crc computing.
> >
> > Actually, as the DECnet installation manual mentions, on an 11/44 or
> 11/70, you probably do not want to use the KG11 even if you have it, as the
> software computation is faster than the hardware device
> > (see page 5-31 of the DECnet-RSX generation and installation manual).
>
> Makes sense. The KG11 is pretty old; if it was created back in the 11/20
> days that would make much more sense, with basic instruction times in the
> 3-5 microsecond range.
>
> paul
>
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