Are we talking about the nominal regulations, or the way things actually ran? Cf. Chaucer, Rabelais, and the Goliardic poems for some information on the latter. Gutenberg's version of Rabelais is a very old translation, but I append a sample anyway:

Going from Bourges, he came to Orleans, where he found store of swaggering scholars that made him great entertainment at his coming, and with whom he learned to play at tennis so well that he was a master at that game. For the students of the said place make a prime exercise of it; and sometimes they carried him unto Cupid's houses of commerce (in that city termed islands, because of their being most ordinarily environed with other houses, and not contiguous to any), there to recreate his person at the sport of poussavant, which the wenches of London call the ferkers in and in. As for breaking his head with over-much study, he had an especial care not to do it in any case, for fear of spoiling his eyes. Which he the rather observed, for that it was told him by one of his teachers, there called regents, that the pain of the eyes was the most hurtful thing of any to the sight. For this cause, when he one day was made a licentiate, or graduate in law, one of the scholars of his acquaintance, who of learning had not much more than his burden, though instead of that he could dance very well and play at tennis, made the blazon and device of the licentiates in the said university, saying,

  So you have in your hand a racket,
  A tennis-ball in your cod-placket,
  A Pandect law in your cap's tippet,
  And that you have the skill to trip it
  In a low dance, you will b' allowed
  The grant of the licentiate's hood.