Date : Sat, 04 Jul 2009 22:09:18 +0100
From : philb@... (Phil Blundell)
Subject: econet bridge protocol
Disassembling the bridge ROM presumably would reveal the truth but I was
hoping to avoid having to do that. :-}
However... looking back in my mailbox I see that Johan Heuseveldt was
working on a disassembly about four years ago. Johan, how far did you
get with that?
I don't think disassembling the MDFS ROM would help much; I don't think
the MDFS has any explicit relationship with the bridge or, at least, I
can't think of any reason why it would need to.
p.
On Sat, 2009-07-04 at 21:52 +0100, Chris Thornley wrote:
> Perhaps it used in building an equavilent of a routers CAM table i.e. a map
> of where networks are so routes can be looked up
> Like using address 1.xxx 2.xxx denotes the network xxx is the station
> number.
>
> Perhaps a disable of a bridge or z80 MDFS rom might help?.
>
> Just a guess really, but it might be a form of network discovery.
>
> Chris
>
>
> /> Christopher J. Thornley is cjt@...
> ( //------------------------------------------------------,
> (*)OXOXOXOXO(*>=*=O=S=U=0=3=6=*=--------- >
> ( \\------------------------------------------------------'
> \> Home Page :-http://www.coolrose.fsnet.co.uk
>
> -----Original Message-----
> From: bbc-micro-bounces+c.j.thornley=coolrose.fsnet.co.uk@...
> [mailto:bbc-micro-bounces+c.j.thornley=coolrose.fsnet.co.uk@...
> uk] On Behalf Of Phil Blundell
> Sent: 04 July 2009 20:42
> To: bbc-micro@...
> Subject: [BBC-Micro] econet bridge protocol
>
>
> Does anybody have documentation on the port &9c protocol used by bridges?
> Chapter 10 of the MDFS book gives some details but doesn't describe the
> messages with control bytes &80 and &81.
>
> Observing the single bridge that I have here, at power up it seems to send a
> broadcast with control byte &80, containing in its payload the number of its
> other local network; I guess this is the "reset packet"
> that the MDFS book talks about.
>
> If I send the bridge one of those packets (cb &80) then it responds with a
> series of packets with control byte &81 and, again, the network number of
> its far side in the payload. I'm not entirely sure what the meaning of
> these packets is, or how (if at all) I am meant to respond to them.
>
> Can anybody shed any light on that? Or, absent any documentation, is there
> anybody with two or more bridges who would be prepared to capture some
> packet dumps showing them talking to each other?
>
> thanks
>
> p.
>
>
>
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