That's an SGI design and Acronym1 is an SGI vendor. You could always drop him a line. I have a 13w3 failing that, but it's a rare model that would cost $35 because its DIP switchable between Sun, SGI and other modes - very rare. I have a special cable that was custom made so I don't need it, but still - its rare.
R16000 700MHz 8GB RAM
kanna
R12000 300MHz SI 896MB RAM
yuuka
R12000A 400MHz V6 2.5GB RAM
(Acclaim) R4600 133MHz XL Graphics 32MB RAM
(Challenge S) R4600 133MHz (MIPS III Build Server)
Thinkpad W530 i7 3940XM 3GHz, 32GB, K1000M Windows 8.1 Embedded rin
Thinkpad R40 Pentium M 1.5GHz 2GB RAM kasha
Layer count will actually be pretty much arbitrary, and sprites are just graphic objects blitted into the layers, so (minus performance considerations) there shouldn't be much of a limit on that. (Heck, you could even have multiple rotozoomer layers - say, a ground map and then a sky map with the same rotation but inverted scaling and a much slower parallax motion. Just need a little fog to hide the sharp-edged horizon and voila, instant skybox.) As for sound, it's still (mostly) in the planning stages, but I'm scheming up a combination subtractive/FM softsynth (plus some kind of wavetable support so at least sampled drums can be used.)
R12000SC 300MHz 192MB RAM 15k 147GB HDD