[ih] Intel 4004 vs the IMP

[Steve Crocker]

Arpanet lines were 50 kbs, not 56 kbs.

Sent from my iPhone

> On Nov 15, 2021, at 9:11 PM, Timothy J. Salo via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> I think we all agree that the IMP was a pretty limited machine.  From
> the backup slides of a presentation of mine:
> 
> Early ARPANET router, Interface Message Processor (IMP), (1969):
> o 16-bit words, 12-16 K-word memory
> o 100-μsec clock (10 KHz)
> o Early ARPANET links: 56 kbps
> o 0.18 clock cycles per bit
> 
> I have argued that this, 12-16 K words of memory, is why we had the
> end-to-end argument (which morphed into a principal and then into a
> canon).
> 
> (The rest of the presentation pretty much ignores the end-to-end
> argument.)
> 
> Also from this presentation:
> 
> Early NSFNET router: DEC LSI-11/73 (1983) with Fuzzball router
> o 512 KB memory
> o (15.2 MHz)
> o 271 clock cycles/bit
> 
> -tjs
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