[Simh] VAX/VMS

[Dave Wade]

> -----Original Message-----
> From: Rhialto [mailto:rhialto at falu.nl]
> Sent: 16 February 2016 19:58
> To: Clem Cole <clemc at ccc.com>
> Cc: Dave Wade <dave.g4ugm at gmail.com>; SIMH <simh at trailing-edge.com>
> Subject: Re: [Simh] VAX/VMS
> 
> On Tue 16 Feb 2016 at 08:58:11 -0500, Clem Cole wrote:
> > Dave be careful --   S/360 Model 67 has VM in the late 1960's - TSS and
> > it's brother MTS, both rely on it.   The 67 is a Model 65 with a  Data
> > Address Translation unit (DAT box) - is supplied by a 8 x 32 bit TLB
> > which is in a cabinet that t'ed off the main CPU and is about the same
> > size en entire Vax 780 which would follow 10 years later.
> 
> Note that I have rescued at some point in the past an IBM patent (it was
the
> UK version) of a computer with microcode, and maybe Virtual Memory too.
> Although they didn't call it that I think. After reading, it described
something

Perhaps relocation. Allows code to run from any start address. Also storage
keys which allow memory to be protected. 
Virtual Memory was first patented by Manchester University and implemented
in Atlas. I believe IBM later acquired this patent.

There are many later patents for virtual memory improvements.....

> remarkably like the S/360. It lists the full microcode and has extensive
> hardware schematics.
> 
> The patent number is 1,108,800. Inventors: Gene Myron Amdahl et al.
> USA patent application number 357372, 6 April 1964. The issued patent
> number is US003400371.
> 

I believe that Amdahl (as a company) also came up with the patent for a
control processor....
... so IBM paid them for every mainframe with a control processor, and
Amdahl paid IBM for the Virtual Memory Patents...

> -Olaf.
> --
> ___ Olaf 'Rhialto' Seibert  -- The Doctor: No, 'eureka' is Greek for
> \X/ rhialto/at/xs4all.nl    -- 'this bath is too hot.'

Dave
G4UGM