[jammin' jamey]

The NBA used have to multiple rounds for drafting...

In the early years of the draft, teams would select players until they ran out of prospects. The 1960 draft went 21 rounds. By 1974, it had stabilized to 10 rounds, which held up until 1985, when the draft was shortened to seven rounds. By agreement with the National Basketball Players' Association, the drafts from 1989 onward have been limited to two rounds, which gives undrafted players the chance to try out for any team.

http://www.nba.com/history/draft_evolution.html