Re: THAAD Study on Ada Viability

["Robert L. Spooner" <rls19@psu.edu>]

We have been moving from VAXELN/VAXELN Ada (83) on the KAV30 VME VAX
hosted on VAX/VMS to VxWorks/GNAT on 68060 and now/soon PowerPC hosted
on Sun/Solaris for similar reasons.  After years of DEC^H^H^HCompaq
saying "buy from us, you'll have a migration path," they ported neither
the operating system nor the compiler to the alpha and Ada95.  VAXELN
Ada was retired.  We could have gone to an alpha vme board with VxWorks,
but it was only supported under Digital unix and the lab didn't want to
support two versions of unix - we already had Sun workstations here. 
(At least they had GNAT develop a version of Ada 95 for the alpha under
VMS.)  So we went from one cpu and file system for host and target to
separate ones (eventually VxWorks worked with a unix file system through
NFS.)  It made life more difficult.  WindRiver is just now coming out
with an operating system with address space protection - something
VAXELN had over ten years ago.

Bob

DuckE wrote:
> 
> "DuckE" <nospam_steved94@home.com> wrote in message
> news:ZAf_5.149027$U46.4839329@news1.sttls1.wa.home.com...
> > I couldn't find a copy of the official announcement, but I believe Compaq
> > has stopped producing VAXen altogether.
> >
> Which, I might add, is why we moved from VAXeln Pascal to Ada95.  It was an
> easy move.
> 
> > SteveD
> >

-- 
                            Robert L. Spooner
                     Registered Professional Engineer
                       Associate Research Engineer
                  Intelligent Control Systems Department

         Applied Research Laboratory        Phone: (814) 863-4120
         The Pennsylvania State University  FAX:   (814) 863-7841
         P. O. Box 30
         State College, PA 16804-0030       rls19@psu.edu