Scott Quinn wrote: Yep, that counts too :) Wow, that's not bad at all. My Tek XD88's a couple of years later than that (and they were considered pretty hot on the graphics front) and is only 8 planes and the equivalent of 4 GE's. Although I've not seen Tek's model 30 XD88 (mine's a model 10) - that had 24bit visuals and may well have had a similar spec to your SGI. I'm almost certain that it included z-buffer too (but it *was* a couple of years later than your SGI). Hmmm, is this an IRIS 3xxx machine (680x0 CPU)? The SGI IRIS FAQ seems to suggest that bitplane bords could be chained together to make various combinations of total planes. I would have thought that sort of modularity was at the expense of more complex features like z-buffer though... cheers Jules