[HECnet] NT 4 on AlphaServer es40

[Johnny Billquist]

On 2013-02-13 21:15, Dan B wrote:
I have been thinking about this, anybody knows if a 100 NIC adapter
attached to the AUI port would actually go 100MB full duplex on the
VAX ?

The AUI port already defines you at 10 Mb/s. You need a different ethernet controller, as the speed is decided by the controller and not the PHY.

On the Alpha it does, but I have never tried the VAX, I would think it
should, it does in the Stromasys and Simh emulators, but I'm guessing.

That is because Alphas actually might have a 100 Mbit/s ethernet controller. No VAX that I know of do.

An emulated machine is a totally different topic. There you are still emulating a 10 Mb/s interface, even though it might map towards a 100 Mb/s physical backend.

	Johnny



On 2/13/13, Steve Davidson <jeep at scshome.net> wrote:


-----Original Message-----
From: owner-hecnet at Update.UU.SE
[mailto:owner-hecnet at Update.UU.SE] On Behalf Of Jordi
Guillaumes i Pons
Sent: Wednesday, February 13, 2013 14:47
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] NT 4 on AlphaServer es40


El 13/02/2013, a les 18:57, Johnny Billquist <bqt at softjar.se>
va escriure:

Which is silly in it self. Why even search the node
database? After all, the MOP request holds all the
information needed to serve it. RSX don't do a lookup at a
boot request. It just serves it.

But even so, it is surprising that even a fairly modern VAX
can't keep up with a PDP-11 here.

Funny thing: a real VAX (VS 4000/60) can't keep up with an
EMULATED PDP-11 running in a Raspberry Pi ;) I had to disable
service in the emulated PDPs or else they tried to serve the
OS to my 4000/90 ;)

Really?   Are you sure that does not have more to do with the fact that
the VAX only has a 10M NIC where as the Raspberry Pi has a 10/100 NIC.
I have not clocked the virtual 11/83 on my RPI but the virtual VAX runs
at about 1.6 VUPs.   That would put it in the VAX-11/785 class - ie not
all that fast...

-Steve



Jordi Guillaumes i Pons
jg at jordi.guillaumes.name
HECnet: BITXOV::JGUILLAUMES








-- 
Johnny Billquist                                   || "I'm on a bus
                                                                  ||   on a psychedelic trip
email: bqt at softjar.se                         ||   Reading murder books
pdp is alive!                                         ||   tryin' to stay hip" - B. Idol