For instance, some of the late 80's / early
90's hardware from the likes of
SGI are pretty impressive in abilities and architecture - using concepts that
have only hit the mainstream in the last few years - but of course they're by
no means 'earliest'...
What about mid-80's SGI? I have an '86 vintage system with 12x geometry engines
and 32 bitplanes - granted it's not Skywriter/VGXT or Reality Engine,
but compared with other graphics from the time it's pretty hot. I fear that it
doesn't have a Z-buffer, though (not completely sure yet).