Re: The history of the MONITOR tops-10)

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#625001

From: Johnny Billquist
Date: Sun, 15 Jul 2018 10:17

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On 2018-07-15 12:03, Huge wrote:
> On 2018-07-15, Johnny Billquist <b...@softjar.se> wrote:
>> On 2018-07-15 01:59, Bob Eager wrote:
>>> On Sat, 14 Jul 2018 21:22:17 +0200, Johnny Billquist wrote:
>>>
>>>> Disk directly to buffers in user space in Linux? Sure, it's called mmap.
>>>> Which, by the way, is more or less a direct ripoff from TOPS-20.
>>>
>>> Which was a ripoff from MULTICS and EMAS.
>>
>> I'm not sure about that. Multics, from what I read, considered memory
>> and files to be the same thing. This is sort of a different idea than
>> saying that you can map a file into a specific part of your memory. I
>> have no idea how or what EMAS is. :-)
>>
>> But the comment about the ripoff goes as far as the Unix mmap API being
>> pretty much a copy of TOPS-20.
> 
> I find the word "ripoff" problematical. Virtually everything in computer
> science is based on something else. Thinking "that's a good idea" and
> re-using it in a new and interesting way is hardly "ripping off".

If you take the concept *and* API and copy it verbatim, I think calling 
it a ripoff is not so wrong.
Had they just taken the concept, then I'd say inspired by, or something 
similar. But this one goes a bit further. I remember back when Sun 
introduced mmap, that I heard (don't remember from where), that they had 
looked at TOPS-20 when they did the implementation for SunOS.

   Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: b...@softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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From: Johnny Billquist <b...@softjar.se>
Newsgroups: alt.sys.pdp10,alt.folklore.computers
Subject: Re: The history of the MONITOR tops-10)
Date: Sun, 15 Jul 2018 12:17:03 +0200
Organization: Update Computer Club
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