Purposefully fudged schematics

To be certain, some errors/additions are deliberate; Rand McNally generally sprikles a few non-existent landmarks in their maps; Google satellite maps have "watermarks" that can be very confusing. I spied what looked to be clearing on some of my forested land and hiked to the very spot and found--trees, just like everywhere else. It took some conferring with a USGS employee to discover that what I thought was a clearing was a rather subtle watermark (viewed in just the right way, you can make out a "Go". On the other hand, we've gotten very spoiled. Go to the Univac 7900 operation documents in bitsavers and you'll discover that their biquinary-to-decimal table counts 1, 2, 2, 4, 5, 6, 7, 8, 9... Incidentally, the 7900 used magnetic core pulse logic, so it's an AC- coupled system (tying two threads together again!). The aforementioned manual is very long but makes interesting reading, if you're into that sort of stuff. The assembler turns out to be written by some joker named Knuth... Cheers, Chuck