[ih] Protocol numbers (was IP version 7)

[Steve Crocker]

Nope.  Bit serial 100 kbs.  Specifically designed to be as simple as possible because each site had to design its own half.  100 kbs was easy to implement and fast enough to keep up with the 50 kbs IMP-IMP circuits.

I assume the description you’ve copied was just an unconscious writing error.

Steve

Sent from my iPhone

> On Dec 25, 2020, at 6:57 AM, Noel Chiappa via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> 
>> 
>> From: Brian E Carpenter
> 
>> ** "Early Experiences with the ARPANET and INTERNET in the UK", 1998
> 
> Very interesting, thanks for the pointer.
> 
> It contains one thing that I'm curious about: "the Interface Message Processor
> (IMP). This were initially attached locally to Host computers by a parallel
> interface." (bottom of pg. 2) I'm unaware of this stage; I thought they always
> used the 1822 bit-serial interface? I'd look at my copy of the BBN proposal
> (in response to the DARPA RFP), which probably talks about whether the plans
> were always for that interface, but alas my son and his wife are asleep in the
> room it's stored in, so I can't. I suppose it's possible a first IMP or so
> were prototypes, and initially used a parallel interface, later replaced by
> the 1822 interface, but I don't recall hearing about that. Can anyone expand?
> 
>    Noel
> 
> PS: That site, ban.ai/multics/, is completely mind-blowing. Check it out.
> 
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