[ih] NCP and TCP implementations
steve at shinkuro.com
Tue Mar 10 11:48:23 PDT 2020
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.
On Tue, Mar 10, 2020 at 2:42 PM Bob Hinden via Internet-history <
internet-history at elists.isoc.org> wrote:
> > 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.
> > Thanks,
> > Leo
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> Internet-history at elists.isoc.org
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