Date   : Wed, 15 Jul 2009 20:46:39 +0200 (BST)
From   : johan@... (Johan Heuseveldt)
Subject: econet bridge protocol

Hi Philip,

Sorry for the delay; was kind of (very) busy with my 6809 2ndP.
This weekend the PCB design was finilised. At last!!

Oh, and I have to dig deep in the messages history, to find...

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

[snip]

> > I have several bridges; 2x Acorn, 1x SJResearch, but I have no clue
> > how to capture these packets. In case you have specific sw to do so,
> > let me know off list. Using Netmon is doable, but needs a lot of know
> > how and expertise knowing where to look for, and how to interpret the
> > data I guess.
> > (and Netmon does /not/ show /all/ the data!)
> 
> If you felt like conducting a couple of tests, some empirical results
> might certainly be handy to confirm that I've understood the disassembly
> correctly.
> 
> 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
> 
> and then capture a packet trace on net #3 while power-cycling the bridge
> between 1 and 2, that might be useful.  More or less any network monitor
> is probably good enough for this; I mostly use either NETMON on a BBC,
> or my own RISC OS monitor on an A5000.  Bridge packets tend just to be
> broadcasts of a couple of bytes so you don't need any sophisticated
> monitoring technology :-)

I had started to create a list for the stuff needed. Good greeve, that's
quite a lot! :-)
This week I realise I forgot I also need two extra clock boxes; the
SJ Research Bridge is so convenient with its build in clock (net B).
But an Acorn clock box is in use for net A, only connecting to a RiscPC.

I must have another Acorn clock box though. I do need to search
for that. Recently I got a BBC-B and a -Master128, including some
Econet cabling. Also included was a SJ Research clock box. But
that seems to be dead, and so far I haven't been able to fix it.

Another problem a space, well, the lack of it.
I do hope next week I can give it a go, with the setup you gave.
Hopefully I'll get somewhere.


Greetings,
Johan

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

  The best place is a Riscy place

Even great wizards turn pale at the mere mention
of the name Yog Sothoth.