Prototyping cards with processors?

[Willard Korfhage]

I am looking for prototyping cards on which to develop a network
interface.  I would like to find a card with a fast processor, a bunch of
RAM, a prototyping area, and some software support. Since this will go in
workstations, VME bus seems most appropriate. The closest card I know of
is Apple's Macintosh Coprocessor Card, with a 68000, 512K RAM, and a
real-time OS for the on-board processor, but this is for the Nubus, not
VME.