<div dir="ltr">The BBN guys will have to respond but I recall contracting with them for an X.25 network for MCI Mail in 1983. Originally I think the CXX's emulated the BBN 1822 interface as a substitute for IMPs that used the Honeywell DDP-X16 processors. Their commecial offerings used X.25 which was a popular standard during the late 1970s and was widely used until the early 2000s (I shut down MCI's X.25 services around 2003) and might still be used in banking/financial transactions system if they haven't all been moved over to TCP/IP by now. </div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Oct 21, 2017 at 7:54 AM, Paul Ruizendaal <span dir="ltr"><<a href="mailto:pnr@planet.nl" target="_blank">pnr@planet.nl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
I'm trying to get a better understanding of the BBN C30, C70 and C60 machines. Google seems to yield little relevant info for them.<br>
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>From brief references in other documents my understanding is that these were microprogrammable machines with 10-bit bytes and 20-bit addresses. Maybe they were all the same machine in different configurations.<br>
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I think the C30 was used to replace the 316/516 as IMP's from 1980 onwards. The C70 seems to have been a "Unix machine", perhaps targeted at a role as gateway (router). The C60 seems to have been a general purpose version for the broader market.<br>
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Any further info about these machines welcome.<br>
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