Date: Mon, 10 Aug 1998 08:30:46 +0930 From: Greg Lehey <grog@lemis.com> To: djv@bedford.net Cc: freebsd-chat@FreeBSD.ORG Subject: Re: FreeBSD Message-ID: <19980810083046.K11095@freebie.lemis.com> In-Reply-To: <199808091403.KAA04576@lucy.bedford.net>; from djv@bedford.net on Sun, Aug 09, 1998 at 10:03:38AM -0400 References: <19980809104012.P14475@freebie.lemis.com> <199808091403.KAA04576@lucy.bedford.net>
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On Sunday, 9 August 1998 at 10:03:38 -0400, djv@bedford.net wrote:
> Greg Lehey wrote
>> (moved to -chat)
>> On Saturday, 8 August 1998 at 7:12:01 -0400, CyberPeasant wrote:
>>> Brandon Lockhart wrote:
>>>>
>>>> You can only have
>>>> one operating system loaded at a single point in time (correct me if I am
>>>> wrong).
>>>
>>> You're wrong :) The IBM mainframe OS, MVS, will run several OS's on
>>> the same machine, simultaneously. Each user gets his own OS. This
>>> is very cool...
>>
>> Nowadays the operating system is called OS/390, also known as UNIX 95.
>> I thought it was VM that ran multiple operating systems, not MVS.
>
> You think correctly. Why do i have MVS on my brain...
>
> for(i=0;i<10000;i++)
> promise("I will not make this misteak again");
>
>> First I've heard of it. I haven't been keeping much track of the 360
>> family in the last 10 years or so, but before that they were decidedly
>> CPU bound.
>
> Well, everything was bound up then. :) The 360/195 (I think this
> was known as the "Stretch")
No, Stretch was the 7030, and predated the 360/<anything> by a number
of years. Supposedly the first machine to achieve 1 MIPS, but it
didn't quite make it.
> was quite snappy in its time. The apps I ran (numerical) were by
> definition CPU bound, anyway. This was a 2 of a kind unit (one for
> NSA, one for Los Alamos IIRC), with a hotrod CPU and a big load of
> memory, how much I've forgotten (128MB? More?), which IIRC was made
> of discrete transistors.
I've never heard of discrete transistor memory of any size. The
System/360 was the first machine in the world to use integrated
circuits in a serious way, but it's possible they made exceptions in
strange machines like the 360/195.
> I think it was faster than its contemporaries in the 370 series. The
> Navy kept it running until ~1986, I believe the power bill was why
> they shut it down. :-) (It was at the PAX NATC in S. Maryland).
Yes, the 360/195 wasn't really a 360 (all other 360s had model numbers
under 100, all 370s over 100). I've forgotten the details, but for a
360 it really moved. It probably had over 1 MIPS.
> It had the cute feature, that if you requested more memory than
> was installed, it would enter your job in a queue, and notify
> the operator to order and install more memory.
This sounds like a side-effect of running OS/VS/1. IIRC it was the
only /360 with virtual memory (and an 8 entry TLB :-)
Greg
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