[Simh] VAX/VMS

[Timothe Litt]

On 16-Feb-16 12:12, lists at openmailbox.org wrote:
> On Tue, 16 Feb 2016 11:52:17 -0500
> Paul Koning <paulkoning at comcast.net> wrote:
>
>>> On Feb 16, 2016, at 9:56 AM, Timothe Litt <litt at ieee.org> wrote:
>>>
>>> ...
>>> Nonetheless, Brooks (@IBM) definitely gets credit for the first
>>> commercial line of architecturally (forward) compatible machines.  Prior
>>> to that inspiration, every new machine was unique and most software
>>> started over (including compilers).
>> I'm not sure that "first" is accurate.  If in the sense of a series of
>> machines for which that feature is specifically marketed, perhaps.  But
>> the PDP4/7/9/15 is another example that started somewhat earlier.  (PDP1
>> doesn't quite match, as I understand it.)  CDC 6000 series definitely
>> fits your definition, and those came out at the same time as the 360.
>> The Burroughs B5000 series is somewhat older (1961, says Wikipedia).
> More correctly we should say the IBM S/360 was the first series of
> computers to be designed around an architecture so that the smallest and
> largest models in the lineup were all architecturally identical (mostly!)
> and that could all run the same OS (mostly). The upward compatibility came
> later, but was enabled by a lot of sound architecture decisions including
> one design regardless of capacity.
>
>> Of all those, the IBM 360 descendants are perhaps the most commercially
>> successful, and also probably the longest lived.
> Not perhaps or probably, but certainly.
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Thanks.


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