On 6/9/2017 11:31 AM, Van Snyder wrote:
> It's possible to run VMS on a VAX simulator from
> http://simh.trailing-edge.com/. There are also simulators for PDP-1,
> PDP-4, PDP-7, PDP-8, PDP-9, PDP-10, PDP-11, and PDP-15. Or you can run
> IBSYS on a 7094. This was developed by a DEC retiree named Bob Supnik.
> It might be faster on a 3 GHz pentium than it was on a real VAX.
VAX architecture support for VMS stopped at version 7.3. DEC Alpha came
out in 1990 and current VMS systems run on HP servers with Intel Itanium
processors. Since Itanium is EOL, current VMS customers are interested
in a way forward, which an x86 port of VMS would offer. Running VAX
emulation is not commercially useful.
My understanding is that the VSI folk are looking to adapt the CLANG
back-end to the "GEM" IL used by the DEC-heritage compilers, or
something like that. (GEM did support X86 - witness CVF - but 32-bit
only and that code hasn't been touched in15 years or so, as far as I know.)
Steve
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