[RndTbl] Null modem serial connection minicom

I'm trying to set up a nullmodem serial connection between a PC (Linux) and a MacSE (OS6.04). I've got some files I want to pump into the old Mac without having to mess with its floppy drive. Anyway, I've got the computers connected with the correct hardware, that is, a Mac serial modem cable pluged into a a 25 pin null modem cable. Zterm on the Mac is all set, but I'm not sure how to set up minicom for a pure serial connection. Everthing I've read about minicom is for a modem, not a serial connection. So here is the question: How do you set up minicom for a simple null modem serial connection? Any information would be appreciated.