> I've seen secondary head 8-bit Newport's for sale on eBay occasionally,
> and the part number listed tallied with a google search, so I think they
> do exist, not sure if there was a 24-bit version or not though, nor the
> GR3-Elan version you suggest.

i stand corrected. (nb: i've never even seen a secondary newport, despite
wandering the labs where such things would be prototyped...)