Re: Honeywell 200

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#618434

From: hanc...
Date: Fri, 26 Jan 2018 21:21

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On Thursday, January 25, 2018 at 12:29:26 PM UTC-5, Dan Espen wrote:

[snip]
> On these smaller machines, this could be used
> to save oodles of memory.
> 
> The S/360 salesman did not appreciate it when
> I pointed out that we couldn't even come close
> to replacing our 8K 1440 with an 16K S/360.

Memory addressing was a big issue in the original concept of 
System/360.  Small machines had simple addresses which saved
memory, big machines had more complex addresses.  Providing space
for a large address was wasteful in a small machine, most
S/360 users were getting small ones.  As a compromise, IBM came
up with the base+displacement method.

I'll let others debate whether that was a good idea or not, and
whether later approaches (such as the x86 addressing) were better.

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