

Found some documentation listing the two middle switches as the rounding switch (up fraction down) and the decimal switch (auto? 0 to 6 then hex?). No idea on the other two.
http://www.calcuseum.com/SCRAPBOOK/BONUS/32853/1.htm
Decimal switch: [A-0-2-3-4-6-F], Round switch: [(ArrowUp)-5/4-(ArrowDown)], Miscellaneous switch: [(Blank)-K .-(Sigma)],
Sadly, most of the ones I’ve found are too complicated, and getting all devices to accept the CA is more hassle than it’s worth for self hosting. I’ve given up and just buy my wildcard cert for 60$/yr and just put it on everything.