On 2017-Nov-27, at 5:25 PM, steve shumaker via cctalk wrote: > On 11/27/2017 2:26 PM, Fred Cisin via cctalk wrote: >>>> The Livermore Data Systems modems that I sold off were from about 1964? >> >> On Mon, 27 Nov 2017, Brent Hilpert via cctalk wrote: >>> Were those the Livermore Data Systems modems in a wood box you were selling? >>> Did you have anything to ascertain the 1964 date for LDS, or were you >>> getting that date from the stuff on the web? >> . . . >>> Someone in some comments suggests LDS wasn't building these until 1968, >>> which strikes me as more plausible. >> >> Thank you! >> >> That is why I put a question mark after 1964. >> I was basing it on nothing more than verbal comment by the guy that I got >> them from. And, while I had them, I hadn't had any reason to particularly >> care. >> >> 1968 does, indeed, seem more plausible. >> >> It still serves to illustrate that 1971 is NOT too early for that NCR. >> >> -- >> Grumpy Ol' Fred ci...@xenosoft.com >> > I can add another data point to the discussion: > > My LDS Model A with SN 0491 has two TI transistors both with data code "6914" > > And for what it's worth, if you have one and have never opened it up, go do > so right now! The three small circuit boards have a 3"x4" piece of the > infamous black foam to pad the cards when inserted in the case. Of course > the foam is mostly gone now except for where it wraps around the cards and > corrodes the components that it touches!
Thanks for the additional datapoint. It does suggest Model A production may likely have started in 1968. Actual date codes in mine were 6908 to 7008. The larger caps are also a good place to look for date codes. I did the schematic, if you have an interest. Eventually I'll get a little web article up for the model. I couldn't find the ebay listing for the NCR modem for some reason, either using the number or by searching by keywords.
