9 Dec
2016
9 Dec
'16
6:22 p.m.
IBM System/360 Model 44 Pamphlet from Nov 1968
http://www.vintagecomputer.net/browse_thread.cfm?id=659
Bill
9 Dec
9 Dec
6:40 p.m.
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
7:56 p.m.
On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning <paulkoning at comcast.net> wrote:
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
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
8:07 p.m.
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:
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
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
8:39 p.m.
On Fri, Dec 9, 2016 at 3:07 PM, Paul Koning <paulkoning at comcast.net> wrote:
compatible
Just like any older / newer computer that is in principle compatible, but
practically not really.
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 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
10 Dec
10 Dec
1:25 a.m.
On Dec 9, 2016, at 3:39 PM, william degnan
<billdegnan at gmail.com> wrote:
On Fri, Dec 9, 2016 at 3:07 PM, Paul Koning <paulkoning at comcast.net> wrote:
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
...
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.
9 Dec
9 Dec
11:46 p.m.
Bill said that Paul said:
On Fri, Dec 9, 2016 at 1:40 PM, Paul Koning
<paulkoning at comcast.net> wrote:
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_Mo…
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.
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
10 Dec
10 Dec
12:15 a.m.
On 12/09/2016 05:46 PM, steven at 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
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participants (4)
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billdegnan＠gmail.com -
jonelson126＠gmail.com -
paulkoning＠comcast.net -
steven＠malikoff.com