31 Jan
2022
31 Jan
'22
10:22 a.m.
It's supposedly used for everything that needs a CRC where the hardware
device itself don't provide it.
Basically, the CRC16 computation is a service in the DECnet executive
environment. As such, anything that needs a CRC16 computation done calls
this same service. And that service then makes use of the KG11 if it has
been configured to do so.
No reason to have multiple implementations of this computation. The
DECnet executive is a pretty neat thing in RSX. It's like an operating
system of its own inside RSX, with its own scheduler, memory management,
and various services.
Johnny
On 2022-01-31 09:50, R. Voorhorst wrote:
By the way, Johnny, was KG11 also used on serial async
Decnet11MP lines or
was that always software?
Reindert
-----Original Message-----
From: Johnny Billquist [mailto:bqt@softjar.se]
Sent: Monday, 31 January, 2022 08:15
To: hecnet(a)lists.dfupdate.se
Subject: [HECnet] Re: KG11 emulation probably defective -->diagnostic ZKGAB0
for KG11 runs without complaints.
I agree that it would be nice to confirm that this works in real hardware,
but I also find it unlikely that it wouldn't.
While DEC was not perfect, I would expect that they actually had tested this
before releasing the software.
Johnny
On 2022-01-31 01:51, R. Voorhorst wrote:
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
@Dave:
It would only be worth the time and energy to prove if current
Decnet11MP in combination with KG11 would work in a Dup to Dup or Dmc
connection, which in hardware take a serious effort.
In virtual reality it is far more easy to arrange such things.
Unless I cannot find a bug quickly enough, then it could be helpful to
request you to check on it.
Thanks though for the time being.
Reindert
-----Original Message-----
From: Dave McGuire [mailto:mcguire@neurotica.com]
Sent: Sunday, 30 January, 2022 18:25
To: The Hobbyist DECnet mailing list <hecnet(a)lists.dfupdate.se>
Subject: [HECnet] Re: KG11 emulation probably defective -->diagnostic
ZKGAB0 for KG11 runs without complaints.
On 1/30/22 12:21 PM, Mark Pizzolato - Info Comm wrote:
On Sunday, January 30, 2022 at 5:34 AM, Reindert
wrote:
> The diagnostics in XXDP for KG11 completes without problems, so far,
> so
good.
> It limits the scope to interface problems
between Decnet11MP and
> Simh
KG11.
We really don't know how robust the diagnostic is and if it exercises
the same details that are used by the DDCMP implementation.
You could run the DDCMP case with KG11 debugging enabled and identify
what
it is doing precisely and then go back and see if the diagnostic is
doing the same stuff...
I have a KG11-A board; if it would be helpful, I can install it in
a
PDP-11 at LSSM perhaps this week.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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