Thanks Gilbert. Got files sent both ways between the MacSE and PC. The PC ( a 486 with Slackware3.6 ) will only download in Xmodem, but can send in Zmodem. The only real problem left is the PC speaker. Minicom gets it beeping after a successful upload or download, which is fine, except it doesn't turn off. It goes into a terrible howl until I exit minicom and press any key on the command line. So I disconnected the 486 speaker to save my ears and all is well. Next I want to figure out the pin connections and make a cable just for this connection. As it is now, I'm using a Mac modem cable, a Null modem cable, and a gender converter, all for this one task, which seems a waste. Thanks again!