All, Does anyone here have, or know where to get, information on the communications protocol for a TI-66 programmable calculator? I want to interface to a PIC using the printer port of the calculator. It has 2 pins, so I'm guessing it might be something like I2C or possibly like the Dallas One Wire protocol. Anyway, if anyone has any info on this, I would appreciate a response. Email me offline at jim@jpes.com. Thanks and Regards, Jim -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist