Apple II swift board

[Richard]

In article <20090503155401.E58B3BA51A4 at mini-me.trailing-edge.com>,
    shoppa at trailing-edge.com (Tim Shoppa)  writes:

> > I've never heard of the "Swift board for the Apple II".  Googling
> > didn't turn up anything useful, although maybe I just didn't use the
> > right incantation.
> 
> Try "SwyftCard".

OK, that turned up a few things, but I'm still not exactly clear on
what was on the board that upgraded an apple //e so much.  Was it just
a processor running FORTH in ROM?
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