In one of my undergrad classes the professor allowed you to bring in a textbook and a single double-sided page of notes. I typed in my outline, printed it out using the smallest font I could...and it really pissed off the others who hadn't thought of it, because I got the whole course outline on the page.
Gotta tell you, if you wear the right glasses, you can even read 1 point font pretty easily if it's laserprinted. Course, my friends called me "Squinty" for a few weeks after that exam...but they asked me for a copy on the next test.
I used to (early '80s) write my notes out on a sheet of 11x17 paper, then Xerox-reduce it down to roughly 8.5x11 to conform to the rules.