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From: John Levine <johnl@taugh.com>
Newsgroups: comp.arch
Subject: Re: The Design of Design
Date: Fri, 10 May 2024 21:35:46 -0000 (UTC)
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According to Tim Rentsch  <tr.17687@z991.linuxsc.com>:
>>> BASIC and DTSS was developed in 1963.
>>
>> Good Point.  So IBM was "guuilty" of vastly mis-understanding and under
>> estimating the future importance of interactive users.
>
>Work on System/360 started in 1961 (and in some sense two years
>earlier, but let's not get into that). 

IBM was certainly aware of CTSS which was running on a 709 and then
7090 in 1961.

As I've said before, I think they thought the 360's design was
adequate for time-sharing, but they guessed wrong and believed it
would be practical to move code or data by updating base registers.
Hence Brooks' comment about SS insructions not having both base and
index, fields and the flat statement in Design of Design is that their
worst mistake was not to include virtual memory.
-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly