Here's an interesting note...Google Books has a whole lot of magazines up now. One of them is Info World. I've had it come up in a lot of searches for old tech products and the articles have been very helpful. If you browse their Info World selection, the furthest you can go back is 12/22/86:
However, most of the articles that have popped up in searches have been from the early 80s - prime time for oddball hardware and non-standard systems. So where are those issues? Well, let's tweak that URL:
Looks like they now start at 12/11/78 - big difference!
They're still indexed by Google yet are not browseable. Intentional or just a bug in their catalog? I dunno.