The strangest computer manual ever written
In the 1980s, there were a lot of microcomputer books heavy on cartoons and jokes and gentle introduction.  As an adult, I've learned there was also (what seems like) a large intersection with counterculture, hippies, etc.<p>Another interesting thing was how unpolished and DIY some of the documentation.  For example, I got a vintage (circa Apple II?) Anadex dot matrix printer at a yard sale, and the manual included instructions for how to select the kind of serial interface (between, e.g., RS232 and closed-loop): by cutting a PCB trace inside.  Not even a DIP switch, but they were fine telling customers it was OK to start permanently mangling a circuitboard to get it to work with their computer.<p>Edit: This might've been the one: <a href="https://www.ebay.com/itm/143078871954" rel="nofollow">https://www.ebay.com/itm/143078871954</a>