Hmmm, I guess someone is going to have to post a pic of their "birth certificate".
I've got a Model M 1393278 made in 2007.
Sometimes people misread the copyright/patent/whatever line on the keyboards as year of mfg. However, the 1984 line was on 1391401 over a decade's-worth of models. I think I read that November '85 was the earliest 1391401 anyone could come up with.
I don't think anyone is, intentionally, trying to pass misinformation. I'm asking anyone that is willing to draft one up, to come up with a comprehensive, idiot-proof, rollover test plan that we can post here so that everyone is testing the same things. Once that is done and we have a general consensus, I will clear out this thread and allow everyone to resubmit using the standardized test.
If we're going to be true to the cause, I just don't want any keyboard getting away under- or over-credited. I don't have enough keyboards lying around to find a semblance of proof for my baseless, anecdotal claims on keyboard electronics layouts. However, until someone does some specific and somewhat scientific testing, I don't think any of us, with our anecdotal evidence, should make final decisions on what constitutes a test!
I mean, we can find out n-key rollover if we take a standard school ruler and run it across any line of a keyboard. That'll get at least 10 keys, probably many more. But what if it passes on the top line, but we do it to the next line, and it fails? What if it passes on the top line but the numpad isn't n-key rollover? It's certainly not n-key rollover, then.
If we're not doing testing only for n-key rollover and looking to describe any-key rollover, well, the testing gets that much harder.
I just suggest we're going to have to put a bit of work into this (unfortunately) to get things right. I mean, why does it make sense I can type "i4lw,z" but not "flip"?