> On 28 Nov, 2015, at 09:19, 'Gregg Eshelman' via Vintage Macs 
> <[email protected]> wrote:
> 
> Anyone know what it is? No external connectors. Looks like just an EPROM and 
> a bunch of other chips and components.
> 
> http://www.ebay.com/itm/201469397533

Looks identical to this: 
http://www.recycledgoods.com/apple-busmaster-rev-c-board-820-0199.html

Described as a “bus master card”.  It may have been used to allow two 
non-bus-master NuBus cards to communicate without CPU intervention.  Quite an 
esoteric application.

 - Jonathan Morton

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