On Fri, Dec 9, 2016 at 3:07 PM, Paul Koning <paulkon...@comcast.net> wrote:
> > > On Dec 9, 2016, at 2:56 PM, william degnan <billdeg...@gmail.com> wrote: > > > > On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning <paulkon...@comcast.net> > wrote: > > > >> > >>> On Dec 9, 2016, at 1:22 PM, william degnan <billdeg...@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.