Date   : Fri, 14 Aug 2009 21:13:25 +0100
From   : philb@... (Phil Blundell)
Subject: econet bridge protocol

On Fri, 2009-08-14 at 21:00 +0200, Johan Heuseveldt wrote:
> The sad...
> ~~~~~~~
> Arrived! But;
> Both damaged line drivers are AM26LS30; '30' for short. Replacing
> both with a new one, didn't work as aspected though. In the end I
> needed a '30' for IC14, and  a '34' for IC16, just as in the other
> bridge. Both bridges are the same with a PCB of '0237,000 Iss.2'.
> There are no modifications found on both of them, including back side.

AM26LS34 is a receiver, not a line driver.  I haven't looked at my
bridge to make sure but it would make sense to have one of each.

> OK, I've asked my supplier if the '34' can be delivered? Yes it
> can, but at a cost of very close to 15 Euro. Minimum number to be
> taken is 10. Is this normal? Is it made of pure gold?

Farnell do carry stock of the AM26LS32 and SN75175, both of which are
fairly similar parts to the AM26LS34.  The SN75175 isn't 100% pin
compatible (the enable inputs work a bit differently) but I think it's
probably close enough that you could plug it in and have it work.  The
'32 is pin compatible with the '34 but has a lower input impedance;
again I suspect it is probably close enough that it would work OK on a
small network.

> Phil,
> ~~~~
> was this of some use? Or was it something already familiar to you?

Yes, thanks, that was indeed useful.  It'd still be interesting to see
the output with the additional network but don't worry about it if this
will be difficult to arrange.

p.