The PDF contains images from a scan done in the mid-90's. Elements on some pages are rather "smudged" -- particularly on the example figures (code and diagrams) that are appended.
I looked a bit but did not find a clearer copy. Would anyone happen to have one? (I.e. one that does not derive from this particular scan done by MIT.)
P.S. There is also a Postscript version available, but it is from the same scan and has the same deficiencies.
Volume 12 of Byte is 1987. Number 10 of that volume is September. Publishing dates typically lead calendar dates by up to a month or more.
Unfortunately, the next issue available, per the archive listing sorted by date, is 12:13, which identifies itself as November. (Perhaps one of their special issues came out in the intervening timeframe, in addition to October.)
I don't see it listed in the table of contents for September nor October. I'm about out of time, at the moment, but I might return to this, or maybe someone else will look at the next few months.
OK, I searched a little more, it's said to be Feb. '88, which seems to be missing, alas. I'd gotten the impression it was a nearly complete collection.