Thanks, folks, for helping me with this. I did enough pushing and twisting to make the connection, although it will potentially loosen each time I plu it in and I may have to rig a cord with a better connector on each end.
As to the setup, it went remarkably smoothly since I didn't have to deal with the coax cable in any way, let alone long-gone TVGOS. The operation is a bit different in that one option seems to be to open Functions when the power is turned on, unless my EH55 and I can decide whether I was engage that option (this EH69 is to be my backup for when my EH55 or EH75 eventually fail). I had to play around a bit with the function choices to work with the edit function (i.e., the default seems to be under Navigator just to deral with the instant recording and when I divided my test recording I initially couldn't find the pre-divide piece directly but another choice gives me a look at all the recordings and their pieces before deletion.
While I remembered the 24-hour clock (which doesn't bother me--I've been in the Army and in Europe, with a distinct preference for the latter), I first forgot the day-month-year protocol and tried to set a timer recording on May 30, 2012 as 5-30-2012 and couldn't figure out why it wasn't working. I tried it again more slowly the second time and noted that while I could slot in the "5" for May, when I tried to slot in the "30" for the date, only the "3" showed up. An additional minute so of thought came up with a "eureka" that the date must be in European protocol. I switched to 30-5-2012 and I was in.
One last thing: the ability to preset the program name on a roster of scheduled timer recordings is an improvement. It's something I missed when my old EH80 expired and I purchased the EH55 as a replacement and had to put up with the after-the-fact titling.
Thanks again for all your help and that also goes for the folks that advised me to completely ignore the EH75 setup process. (I still haven't got that one set up to both let me do timer recordings and set the clock.)