Tue Apr 23 17:02:01 2002
Emmanuel Rialland wrote:
> I know that those questions could sound provocative and but here we
> 1) why C++?
> why not lisp / scheme / OCaml or anything else (I remember
> that simh was mentionned).
Easier to put on raw hardware. If we were doing this in Lisp, and
didn't care so much about a Lisp OS, putting more work into CMUCL/SBCL
and gutting a Linux distro might be the way to go.
> I readily admit my brains melt reading the current code. I don't understand a
> lot of it.
Join the club.
> 2) most of the game consoles emulators developers like to put some sort of
> "dynarec engine" (dynamic recompilation)?
> I read some pages of this link
"Dynamo" was one that I remember reading about. It would be nice to
> Looks good, fancy and complicated.
> Has anybody wondered about that too? Pushing the enveloppe I could imagine
> Open Genera for Alpha running on a reverse fx32 (alpha library to run i386
> code) running on a Transmeta.
At one point in the distant past, when I first heard about Transmeta's
approach, and before I knew they weren't going to let us open the hood
beneath the x86 layer, I was hoping we could build a Nouveau(x?/elle?)
LispM on it. It seemed the parallel (VLIW, or so I thought) type
execution units could speed up some tag-checking and other stuff.
Two other approaches that piqued my curiousity were:
(a) FPGA-based PCI form-factor daughter boards for PCs. Apparently
there are such beasts, complete with PC-based design tools that let you
roll your own custom CPU. With a little bit of "life support" software,
you could have a Return of the Son of MacIvory (PC rather than Mac).
(b) A "soft" CPU (I forget the manufacturer), which was a sort of RISC
part implemented inside of a single FPGA with lots and lots of extra
gates unused, with tools to let you roll your own co-processor out of
the remaining gates. The RISC part would become the New FEP, and you
could configure a Lisp processor on the same chip with the unused
gates. It also came mounted on a reference board, to ease development.
Ah, well. Pipe dreams...
==== John Morrison
==== MAK Technologies Inc.
==== 185 Alewife Brook Parkway, Cambridge, MA 02138
==== vox:617-876-8085 x115