One came with the OS XII emulator in its miscellaneous folder. There was lots of mention of nulib and even nulib2-and a version on the Macintosh. But every place I looked (and this was days of hunting, reading, trying) refused to give up the secrets. I rummaged through site after site, lengthy detailed explanations, conversion directions, etc. I struggled mightily to find good step by step directions on how to do this.