From mboxrd@z Thu Jan  1 00:00:00 1970
From: nobozo@gmail.com (Forrest, Jon)
Date: Wed, 8 Nov 2017 12:11:12 -0800
Subject: [TUHS] pre-more pager?
In-Reply-To: <20171108200222.B6A6F18C0B9@mercury.lcs.mit.edu>
References: <20171108200222.B6A6F18C0B9@mercury.lcs.mit.edu>
Message-ID: <0df737f5-f356-7252-2404-1acc43e52adb@gmail.com>



On 11/8/2017 12:02 PM, Noel Chiappa wrote:
>      > From: Jon Forrest
> 
>      > In the early days of Unix I was told that it wasn't practical to write a
>      > pager because such a thing would have to run in raw mode in order to
>      > process single letter commands, such as the space character for going on
>      > to the next page. Since raw mode introduced a significant amount of
>      > overhead on already overtaxed machines, it was considered an anti-social
>      > thing to do.
> 
> Something sounds odd here.

I agree, now that I think about it. I do remember being told not to
write such a thing, due to the load it would cause. Maybe John Nagle,
who had the cube next to mine, might remember better.

> Overhead was definitely an issue with EMACS on Multics, where waking up a
> process on each character of input was significant. I think Bernie's Multics
> EMACS document discusses this. I'm pretty sure they used the Telnet RCTE
> option to try and minimize the overhead.

I remember ~40 students at UCSB trying to run 'vi' on a Vax 780 with 4MB of
RAM. Between the lack of memory and the overhead of raw mode, it wasn't
a pretty sight.

Jon