[ih] NCP and TCP implementations

[Steve Crocker]

There's actually quite a bit of documentation on why the Honeywell 516 was
chosen for the IMP.  The short version is the interrupt structure and
ability to add I/O devices.  Proximity of the Honeywell operation to BBN in
Cambridge also played a role.

Steve


On Tue, Mar 10, 2020 at 2:42 PM Bob Hinden via Internet-history <
internet-history at elists.isoc.org> wrote:

> Leo,
>
> > On Mar 10, 2020, at 10:19 AM, Leo Vegoda <leo at vegoda.org> wrote:
> >
> > On Tue, Mar 10, 2020 at 9:02 AM Bob Hinden via Internet-history
> > <internet-history at elists.isoc.org> wrote:
> >
> > [...]
> >
> >> I later did a TCP implementation for the TAC in H-316 assembly language.
> >> Was lots of fun doing 32-bit segment calculations on a machine with
> 15-bit arithmetic.
> >
> > Do you know why the designers of the TAC chose 15-bit arithmetic for it?
>
> No idea, it was the same architecture used for the IMPs, I am sure someone
> here knows why that machine was picked for the IMP.
>
> Bob
>
> >
> > Thanks,
> >
> > Leo
>
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