[ih] NCP and TCP implementations

dave walden dave.walden.family at gmail.com
Tue Mar 10 14:59:05 PDT 2020

The 516/316 was a typical minicomputer circa 1968.  Alex McKenzie 
shortly before had evaluated some minicomputers for another possible 
project.  For choosing a minicomputer for the IMP, that prior evaluation 
was reviewed, and the 516/316 was suitable for our IMP design in terms 
of speed and memory size.  It was convenient that the DDP division of 
Honeywell was close to BBN.  I don't remember if there being a hardened 
516 version matter a lot, but Frank Heart was very happy to be able to 
use the 516s for the first few IMPs.  What we told ARPA about the 516 
choice is on appendix pages D-1 to D-3 at 
https://walden-family.com/bbn/arpanet-prop-ocr.pdf as well as at other 
places in the proposal, e.g., the timing calculations.

On 3/10/2020 11:42 AM, Bob Hinden via Internet-history wrote:
> I am sure someone here knows why that machine was picked for the IMP.

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