IBM System/360 Model 44 Pamphlet

[william degnan]

On Fri, Dec 9, 2016 at 3:07 PM, Paul Koning <paulkoning at comcast.net> wrote:

>
> > On Dec 9, 2016, at 2:56 PM, william degnan <billdegnan at gmail.com> wrote:
> >
> > On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning <paulkoning at comcast.net>
> wrote:
> >
> >>
> >>> On Dec 9, 2016, at 1:22 PM, william degnan <billdegnan at gmail.com>
> wrote:
> >>>
> >>> IBM System/360 Model 44 Pamphlet from Nov 1968
> >>>
> >>> http://www.vintagecomputer.net/browse_thread.cfm?id=659
> >>
> >> Nice.  The caption is odd; it claims that "... instruction set was
> >> compatible with the /30 through /91 models" when the pamphlet itself
> makes
> >> it quite clear that this is not so (no SS instructions).
> >>
> >> It's curious that the emulation feature, which adds software emulation
> of
> >> those instructions, isn't mentioned, and in fact I haven't seen it
> >> mentioned anywhere.
> >>
> >>        paul
> >>
> >>
> >>
> > Paul,
> > You're right, the brochure says only through the /75, my error.  I fixed
> > the page.
> >
> > I should have written programs written for the Model 44 will be
> compatible
> > with the System/360 Model 30 through 91, provided the configurations are
> > comparable and the programs and not time dependent.
>
> That's true, but the wording implies that the converse holds (360/75
> programs will run on 360/44) which is usually not true.  "Compatible subset
> of the ... models" would be clearer.
>
>         paul
>
>
>
Just like any older / newer computer that is in principle compatible, but
practically not really.