IBM System/360 Model 44 Pamphlet

[Paul Koning]

> 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