Software or Hardware?

:-)

That's BeebEm talking to my a5000 running L4.

Actually, it's still somewhat unreliable. It works most of the time
in Master 128 mode, with ANFS 4.25, but in Model B with NFS 3.60 it
seems to get stuck.. I think it's a timing issue, I found my
initial problems with it re-sending the scout after I'd ack'd it once
already was cured by waiting a short time before creating the ack.
This may be something similar.

I'm glad to get so far, though - going to be unable to do anything
with it after this weekend for a few days, so it's good to stop on a
high note!

I'll keep playing in any spare moments over the weekend to see if I can get it any
better... and I've yet to check it still talks to itself ...

Rob