[TUHS] Photos of University Computer Labs

[Larry McVoy]

On Thu, Dec 23, 2021 at 01:05:55PM +0000, Michael Kj??rling wrote:
> On 22 Dec 2021 18:18 -0800, from lm at 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.  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.