Date   : Tue, 04 Dec 2007 16:00:48 +0000
From   : fragula@... (Fragula)
Subject: Tube splitter

Does anyone know what type of outputs (on the Tube<TM> side) the
Tube<TM> ULA has? If they are totem pole, it should be feasable to rig
some sort of circuit (i.e. via a few diodes etc.) that monitors the
TUBE<TM> and will not enable the Tube ULA outputs if another Tube ULA is
already using it.

Cheers1

M.


Rob wrote:

>I'm not aware of any commercial offerings, however I've seen instances
>where two co-processors have been crimped onto the same ribbon cable,
>with power to each individually switched - just turn on the one you
>want to use.  I'm not convinced at how good for the tube ula this
>might be, though.
>
>Something a bit more sophisticated that provides electrical isolation
>between the devices shouldn't be too hard to run up with a handful of
>TTL buffer chips, and that then lends itself to introducing software
>controlled switching between them too.
>
>Rob
>
>On 04/12/2007, silvercreekvalley <silvercreekvalley@...> wrote:
>  
>
>>Is there such a thing as a 'tube splitter' eg
>>some way of switching between two co-processors.
>>
>>This is on a BBC. I have two co-processors in
>>use and its something of a pain to keep unplugging
>>etc with the cabling being underneath the BBC.
>>
>>Thanks
>>
>>Ian.
>>
>>
>>
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