I meant to say when TCP/IP was publicly available. I think ARPANET was only 
available to the military.

Jon Perryman.



>________________________________
> From: Anne & Lynn Wheeler <l...@garlic.com>
>To: IBM-MAIN@LISTSERV.UA.EDU 
>Sent: Tuesday, November 5, 2013 2:14 PM
>Subject: Re: z/OS is antique WAS: Aging Sysprogs = Aging Farmers
> 
>
>jperr...@pacbell.net (Jon Perryman) writes:
>> * UNIX: TCP/IP was not publicly available until the 70's. Prior to
>> that, simple communications were available.
>>
>>  * z/OS: SNA existed long before TCP/IP was available. SNA was a
>> robust, reliable and secure communications methodology. Once TCP was
>> became available, we had the same situation as Betamax versus VHS. TCP
>> won.
>
>arpanet was host-to-host with IMPs from late 60s ... and in many ways
>similar to SNA (but well before SNA). big problem was that it wouldn't
>support large distributed ... and frequently autonomous, decentralized
>infrastructure ... and so start was made on internetworking protocol.
>
>the great change over of arpanet to internetworking (tcp/ip) protocol
>came 1Jan1983. at the time there was approx. 100 IMP network nodes with
>around 255 connected hosts.
>
>

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