earliest graphics display system in your collection?

[Scott Quinn]

>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).