[ih] Intel 4004 vs the IMP

[Jorge Amodio]

Yup, 6 modem interfaces on the IMP design, I remember that it was on one of
the early reports from BBN #1763 (1969).

Here you go, a very detailed description of the IMP design by BBN.
https://walden-family.com/impcode/1969-initial-IMP-design.pdf

Cheers
Jorge



On Mon, Nov 15, 2021 at 9:00 PM Jorge Amodio <jmamodio at gmail.com> wrote:

>
> Weren't the BBN modems capable of handling up to 6 "phone lines" at
> 50,000bps. So basically analog dedicated phone lines.
>
> I'm sure the early lines were not DDS 56K
>
> Regards
> Jorge
>
>
> On Mon, Nov 15, 2021 at 8:35 PM Steve Crocker via Internet-history <
> internet-history at elists.isoc.org> wrote:
>
>> 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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>