From: Dr Iain Maoileoin <iain@csp-partnership.co.uk>
To: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] Photos of University Computer Labs - now off topic
Date: Thu, 23 Dec 2021 15:29:18 +0000 [thread overview]
Message-ID: <ca9d9c00-fd60-b8f9-c5b4-e00c7d7ad07c@csp-partnership.co.uk> (raw)
In-Reply-To: <20211223141958.GR24180@mcvoy.com>
[-- Attachment #1: Type: text/plain, Size: 1823 bytes --]
On 12/23/21 2:19 PM, Larry McVoy wrote:
> On Thu, Dec 23, 2021 at 01:05:55PM +0000, Michael Kj??rling wrote:
>> On 22 Dec 2021 18:18 -0800, from lm@mcvoy.com (Larry McVoy):
>>> The CP/M machines bring back different memories, using that and BDS
>>> C because an 11/780 with 4MB of ram and 40 users meant each user was
>>> getting 1KB so it swapped and swapped and swapped.
>> 4 MB RAM and 40 users works out to 100 KB of RAM per user for me. Even
>> accounting for a large at the time OS it should be several tens of
>> kilobytes per user on average for actual useful data. So, because
>> there's probably some detail here that means you're right and I'm
>> wrong, how do you arrive at the figure 1 KB of RAM per user in that
>> scenario?
> Probably boomer doing math wrong.
I might get flamed for this comment, but is a number divided by a number
not arithmetic. I cant see any maths in there.
In my support I point out that the "dc" manual page says
dc is a reverse-polish desk calculator which supports unlimited precision arithmetic.
In Scotland - at least years ago - arithmetic was an examinable subject
at the lower grades (you also get a mathematics exam at the same grade).
Arithmetic could not be taken past the basic level, mathematics could.
Nowadays they have lumped arithmetic into maths (pronounced "maffs").
Do other countries have this change in language?
Sorry for the intrusion. It is Christmas with me (or is it "happy
holiday" to be politically correct).
> You are right, I'm wrong. Though I
> will say that 100K/student was _painful_. Not enough to run make/cc in
> any reasonable time. About the only thing that worked was ^t (I think
> that was it) that showed you some basic info about performance.
I had forgotten about control-t - does anything modern still do that ;-)
[-- Attachment #2: Type: text/html, Size: 2917 bytes --]
next prev parent reply other threads:[~2021-12-23 15:53 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 15:11 [TUHS] Photos of University Computer Labs Alexander Jacocks via TUHS
2021-12-22 20:31 ` josh
2021-12-22 21:07 ` Rob Pike
2021-12-22 21:15 ` Rob Pike
2021-12-23 4:28 ` Warren Toomey
2021-12-23 4:31 ` Alexander Jacocks via TUHS
2021-12-23 4:45 ` Rob Pike
2021-12-22 21:14 ` Win Treese
2021-12-23 0:48 ` Adam Thornton
2021-12-23 1:30 ` Adam Sampson
2021-12-23 2:18 ` Larry McVoy
2021-12-23 13:05 ` Michael Kjörling
2021-12-23 14:19 ` Larry McVoy
2021-12-23 15:29 ` Dr Iain Maoileoin [this message]
2021-12-23 16:00 ` [TUHS] Photos of University Computer Labs - now off topic Larry McVoy
2021-12-23 16:28 ` Dr Iain Maoileoin
2021-12-23 16:35 ` Larry McVoy
2021-12-23 16:47 ` Dr Iain Maoileoin
2021-12-23 22:15 ` Steve Nickolas
2021-12-24 20:57 ` Derek Fawcus
2021-12-23 16:02 ` Warner Losh
2021-12-23 16:19 ` Larry McVoy
2021-12-23 22:13 ` Steve Nickolas
2021-12-24 3:48 ` Theodore Ts'o
2021-12-28 21:45 ` Greg A. Woods
2021-12-29 16:58 ` Theodore Ts'o
2022-01-09 19:04 ` Stuart Remphrey
2021-12-25 0:00 ` [TUHS] Photos of University Computer Labs Mike Markowski
2021-12-29 2:44 ` Alexander Jacocks via TUHS
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ca9d9c00-fd60-b8f9-c5b4-e00c7d7ad07c@csp-partnership.co.uk \
--to=iain@csp-partnership.co.uk \
--cc=tuhs@minnie.tuhs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).