Re: Proposed Assembler Commands
- From: Mike Monett <no@xxxxxxxx>
- Date: Sat, 30 Apr 2005 23:22:39 -0400
keith wrote:
>
> On Sat, 30 Apr 2005 12:54:34 -0400, Mike Monett wrote:
[...]
> > Yes, but there's not many people left who have seen a 360 or know what it
> > is:)
>
> Oh, really? Have you looked at your bank? Ok, so IBM changed the
> name from s/360 to zSeries, but it's still making quite a good
> chunk-o-change.
The s/360 dates from 1964, and I doubt any of the original systems are
still running. You couldn't even afford the electricity they need
nowadays:)
The basic s/360 design evolved through many different systems. Here's a
nice review along with pictures of the original hardware. Note the DRAM
prices:)
-----------------------------------------------------------------------
The original 360 family was announced in 1964, and the lower midrange
model 40 was the first to ship a year later. The most interesting version
was model 67 (first shipped June 1966) which had hardware to support
virtual memory. IBM had planned a special operating system for it
(TSS/360), which they never managed to get to work well enough to be
usable. Within IBM, model 67 was used with a system known as CP-67, which
allowed a single 360/67 to simulate multiple machines of various models.
This turned out to be very useful for developing operating systems.
In the summer of 1970, IBM announced a family of machines with an
enhanced instruction set, called System/370. These machines were all
designed with virtual hardware similar to 360/67, and eventually all the
operating systems were enhanced to take advantage of it in some way.
[...]
Big, fast disk drives were one of the strengths of IBM. In 1973, the big
mainframe disk drive was model 3330-11: 400 MB for $111,600 or $279/MB.
By 1980, you could get the 3380: 2.5GB for $87,500 or $35/MB. DRAM prices
were dropping, too: In 1979 the price was cut from $75,000/MB to
$50,000/MB.
Through the 1970's and 1980's, the machines got bigger and faster, and
multi-processor systems became common, but the basic architecture did not
change. Around 1982, addresses were extended from 24 bits to 31 bits
(370-XA), and in 1988 extensions were put in to support multiple address
spaces (370-ESA).
In 1990, the ES/9000 models came out with fiber-optical I/O channels
(ESCON), and IBM began using the name System/390.
http://www.beagle-ears.com/lars/engineer/comphist/ibm360.htm
-------------------------------------------------------------------------
Mike Monett
.
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