Date   : Tue, 04 Aug 2009 15:37:53 +0200 (BST)
From   : johan@... (Johan Heuseveldt)
Subject: econet bridge protocol

Hi,

On Mon 27 Jul, Johan Heuseveldt wrote:
> On Wed 15 Jul, Johan Heuseveldt wrote:
> > On Mon 06 Jul, Phil Blundell wrote:
> > > On Mon, 2009-07-06 at 00:45 +0200, Johan Heuseveldt wrote:

> Update...

> > > In particular, if you connect the three bridges in a chain, something
> > > like:
> > > 
> > > net 1
> > > |
> > > Acorn bridge
> > > |
> > > net 2
> > > |
> > > SJ bridge
> > > |
> > > net 3
> > > |
> > > Acorn bridge
> > > |
> > > net 4

[snip]

> More concern was one of the Acorn Bridges; It was dead. It turns
> out the line drivers weren't functioning. I tried the drivers of
> the good bridge, and then I have a good bridge! Phew!
> [...]
> Checking the Farnell catalogue, I couldn't find it. Checking a
> paper based datasheet - down loaded from www.datasheetcatalog.com -
> it was stated the AM26LS30 is also a direct replacement for the
> National Semiconductor DS3691, and that one was in the Farnell
> catalogue! It's however in a SOIC package. I will order a couple,
> assuming it must be possible to solder these on DIP sockets.

Although ordered, later I found the DIL variants. This was a
distributor, and no stock. He did his very best to find out if
those still could be delivered. They are! He directed me to an
electronics shop in Amsterdam. I should receive the line drivers
at home in about 14 days, as they're coming from abroad. That's
the end of next week. Fingers crossed!



<jgh>

On Thu 16 Jul, Jonathan Graham Harston wrote:
 
> Is the network dump at http://mdfs.net/Apps/Networking/NetMonitor
> any use?

Thanks. I did give it a try. Nice.

I have found easily the serial cable I had made years ago. Using
the two machine setup as with your progs, it turns out the cable
was ok!

At some point the output was more than a single line, so I would
like to SPOOL that output. Using the same method, the second
machine was not running any program, but in BASIC at the command
prompt. From there SPOOL was opened on DFS, and whatever came in
from the NETMON machine was spooled together with BASIC's
'Mistake' responses to file.
So a small bit of cleaning was needed. :-)

</jgh>



The following was monitored from net 3, when the bridge between
nets 1 and 2 was switched on:


FFFF1818809Cv02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i
FFFF3030819C03v02 i


It's interessting to see the net and station numbers used
by the bridges. The first with 24.24, later ones with 48.48.

These could be sequence numbers. Anyway, it will be highly
interessting to see what happened further to these numbers
when the 4th net will be present.



For now I hope it is already of some use!



> So, I'm almost there!
> <to-be-continued>




Greetings,
Johan

-- 
Johan Heuseveldt <johan@...              >
  aka  waarland

  The best place is a Riscy place

Build a system even a fool can use and only a fool will use it.