[ih] how big was the host file

[Stephen Casner]

In 1973 ISI had only one IMP, number 22.  There was only one PDP-10 at
the time, the KA-10, but by the fall there were at least two hosts,
with the second being a PDP-11.  I know that because that's when I
joined ISI, and the first project I worked on was helping to debug the
ISI-developed, ANTS-variant IMP interface for the PDP-11.

                                                        -- Steve

On Thu, 6 Feb 2020, Craig Partridge via Internet-history wrote:

> I pulled up my ARPANET map collection.  The map does not show how many
> connections were at each IMP, but you can make some informed guesses.
>
> In September 1983 (pre-MILNET split), there are multiple sites with
> multiple IMPs.  I'm guessing that we typically used up all the IMP ports
> before giving someone another IMP.  So...
>
> ISI had three IMPs.  SRI had three IMPs.  SAC had two IMPs. ARPA had two.
> Those are additions to your list of Stanford, MIT, UCLA and BBN.
>
> Thanks,
>
> Craig
>
> PS: The map reading led to a trivia question -- which locations were the
> last ones to use IMPs with the old Honeywell hardware.... (NYC, NSA, Texas,
> and TYM [I don't recall who TYM was]).  This per the April 1983 map.
>
> On Thu, Feb 6, 2020 at 7:03 AM John Day via Internet-history <
> internet-history at elists.isoc.org> wrote:
>
> > Then I was wrong. 64 was just IMP numbers. Ports were separate.
> >
> > How many IMPs have multiple hosts?  Stanford, MIT, BBN, UCLA, I know. Who
> > else?
> >
> > John
> >
> > > On Feb 6, 2020, at 08:40, Lars Brinkhoff <lars at nocrew.org> wrote:
> > >
> > > John Day wrote:
> > >> Lars Brinkhoff wrote:
> > >>> An MIT hosts file from 1973 was 134 lines.
> > >> Why was it so large?
> > >>
> > >> There certainly weren't 134 hosts on the 'Net in 1973.  Wasn't the
> > >> maximum number then still 64?
> > >
> > > Sorry, I see now the file has two lists.  The first list is in
> > > alphabetical order, and the second is in numerical-ish order.
> > >
> > > There are 66 unique host numbers, of which 14 are TIPs.
> >
> > --