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more ?s about the xl3600
Date: Thu, 10 Jan 91 13:36 EST
From: Barry Margolin <intvax!barmar@Think.COM>
Date: Thu, 10 Jan 91 10:22:17 MST
From: email@example.com (David R Strip )
In his description of the xl3600, peter paine writes:
The FPA option is a 125 Transputer hypercube coprocessor which can also
be used to run concurrent Lisp through shared memory.
I'm baffled ;-)
Why does a machine of this class have an FPA option. I would think it should be standard
It's already pretty fast without it. You'd have to be pretty desperate
to need to accelerate it even more.
Really? The posted spec said that the box contained 3 Ivory Mk.4 chips. The Ivories that
I have been familiar with used external FPAs (Weitek, I think). When was the FPA integrated
into the Ivory chip? Or is there a standard FPA in the xl3600 distinct from the
optional Transputer one?
I'm even more baffled by how you configure 125 nodes as a hypercube.
Sounds like a four-dimensional hyper-pentagonal-prism, with five nodes
along each edge.
If that is true, then you only have a three-dimensional thing, which seems to limit
the amount of routing versatility. Seems like a strange choice of geometry, though
I haven't been following the area that closely. BTW, do you know what programming
options there are for the hyper-thing, or is it done transparently in the compiler?