Re: IBM System/360 Model 44 Pamphlet
> On Dec 9, 2016, at 3:39 PM, william degnan wrote: > > On Fri, Dec 9, 2016 at 3:07 PM, Paul Koning wrote: > >> >>> ... >> >> 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. >> > Just like any older / newer computer that is in principle compatible, but > practically not really. Not quite. In the case of the 360/44, it wasn't compatible in principle either, not even close and quite intentionally. paul
Re: IBM System/360 Model 44 Pamphlet
On 12/09/2016 05:46 PM, ste...@malikoff.com wrote: Thank you for the interesting brochure Bill, as far as I know the Model 44 was a bit of an odd duck in having a modified instruction set. The model 44 was a non-microcoded machine, and the lowest model with full 32-bit data paths. (Model 30 was 8 bit!!, model 40 was 16 bits). The /44 was aimed at scientific computing and process control applications. Yes, certainly an odd duck. It had some other oddities, such as optional integrated files (disk drives installed internal to the CPU cabinet) and direct I/O support (basically parallel input and output registers). The /44 lacked all character and decimal instructions, but the floating point performance was close to (or in some cases can even exceed) the 360/50 performance. Jon
Re: IBM System/360 Model 44 Pamphlet
Bill said that Paul said: > On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning wrote: >> >> > On Dec 9, 2016, at 1:22 PM, william degnan 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. > > Bill Thank you for the interesting brochure Bill, as far as I know the Model 44 was a bit of an odd duck in having a modified instruction set. I have something relevant of my own to contribute: My dad's 360 Reference Card with his scribbled-on annotations for the Model 44 ie, 2044 CPU: http://web.aanet.com.au/~malikoff/ibm/IBM_System_360_Reference_Card_with_Model44_2044_CPU_annotations_by_Alec_Malikoff.pdf The annotations are on pages 1, 2, 5 and 6. I think at least one of the universities here in Oz had a Model 44, I guess he had to service it, but mainly he was a Model 40 CE. Steve.
Re: IBM System/360 Model 44 Pamphlet
On Fri, Dec 9, 2016 at 3:07 PM, Paul Koning wrote: > > > On Dec 9, 2016, at 2:56 PM, william degnan wrote: > > > > On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning > wrote: > > > >> > >>> On Dec 9, 2016, at 1:22 PM, william degnan > 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.
Re: IBM System/360 Model 44 Pamphlet
> On Dec 9, 2016, at 2:56 PM, william degnan wrote: > > On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning wrote: > >> >>> On Dec 9, 2016, at 1:22 PM, william degnan 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
Re: IBM System/360 Model 44 Pamphlet
yes this is mentioned in the pamphlet... Ed# In a message dated 12/9/2016 12:57:01 P.M. US Mountain Standard Time, billdeg...@gmail.com writes: > 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.
Re: IBM System/360 Model 44 Pamphlet
On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning wrote: > > > On Dec 9, 2016, at 1:22 PM, william degnan 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. Bill
Re: IBM System/360 Model 44 Pamphlet
> On Dec 9, 2016, at 1:22 PM, william degnan 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
IBM System/360 Model 44 Pamphlet
IBM System/360 Model 44 Pamphlet from Nov 1968 http://www.vintagecomputer.net/browse_thread.cfm?id=659 Bill
