Re: The history of the MONITOR tops-10)

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#625015

From: Johnny Billquist
Date: Sun, 15 Jul 2018 10:03

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On 2018-07-15 08:37, Rob Warnock wrote:
> Johnny Billquist  <b...@softjar.se> wrote:
> +---------------
> | John Levine wrote:
> | > In terms of getting useful work out of a computer that ran at about
> | > 5MHz (yes, I know the KA was async) and had 1MB of core, TOPS-10 wins
> | > just as much.  It had features that mattered then but don't any more
> | > like doing disk I/O directly in and out of buffers in user space
> | > without an extra copy.  I could have done without the sequence numbers
> | > with the flag in the low bit of the word, though.
> |
> | 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.
> +---------------
> 
> Actually, TOPS-10 user-space buffered I/O was closer to Linux/Unix's
> DIRECT_IO mode than to mmap(), except it was naturally multi-buffered.

You are most probably absolutely right. But I talked about Tops-20, not 
TOPS-10. :-)

   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 12:03:08 +0200
Organization: Update Computer Club
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