Mystery Acorn Econet card

[mark0x01]

I have this card in my collection which might be an early prototype Filestore card, but is nothing like what was released.
It might have come from my vist to Barson Computers in Australia, who were involved in early econet development.

It has both econet port and two tube interfaces, confirmed by the pinouts and a quick comparison to the econet schematics (eurocard & electron) shows the usual econet chips and SKT would hold a dip switch.
The tube ports are in parallel, so it looks to use passthrough to allow access to another tube device.

 

[Pernod]

Not seen one of these boards before, definitely Econet but PL1/PL2 are unlikely to be Tube. The data lines appear to go to different pins on each PL connector, and you can't have Tube passthrough as only a single Tube device can be used at any time. Only the 1MHz bus can have passthrough, but that's only 34 pins.

I suspect this is Acorn Atom related, but would expect a Eurocard type connector if it was.

Can we see a photo of the other side?

 

[mark0x01]

The other side.

 

[Pernod]

Hope you don't mind but I've re-posted your photos over at https://stardot.org.uk/forums/viewtopic.php?t=27553, where there's plenty of Econet experts to see it, including one from Barson.