On Thu, 21 Mar 2002 at 14:23:49, ZN wrote:
(ref: <[EMAIL PROTECTED]>)
>Observing the ports in question (with not entirely adequate equipment!) may
>have resultind in the impression that the signals are the same - they are
>not. Also, the net port only has two pins, really - one is ground and the
>other is a bidirectional input/output (it is however externally combined
>out of separate in and out pins on the 8302 ULA). The only reason why two
>connectors are provided is to avoid the need for a T splice and terminator,
>that would need to be employed dependant on the cabling (it's similar to
>coax ethernet in this respect). The idea is sound, but the execution, due
>to substandard quality connectors, is not :-( I'm sure Tony F. can
>elaborate!
Not much more. The QL ones are certainly very sub standard.
All QL networks by definition have one empty socket. The socket when
empty provided a 330 ohm termination.
Unfortunately it needed very little use to make in the third connector
not reconnect when empty.
A neat solution is always to have two jack plugs with 330 Ohms across
the pins in each - or never use one socket (difficult in 3+ networked
QLs (8-)# )
Very very often a non-working network (on QLs I repair) was cured by
bending back the third connector.
--
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