Hello everyone, Just wanted to let you know that if you set the baud rate to 110 baud = and turn handshaking off, the buffer does not overflow and the plotter = works fine. For my task (PCB drawing), there's plenty of speed. In = case anyone is going to run into this problem again, here are the dip = switch settings,=20 S S U A B B B B 2 1 Y S 3 4 3 2 1 +-------------------------------------+ | +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | 1 | | | | | | | |X| | | | | | | |X| | | | | +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | | |X| |X| |X| | | |X| |X| |X| | | |X| | | +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | 0 +-------------------------------------+ =20 What? Your mail program is not configured to use fixed font? >;-) Thanks to everyone who contributed, special thanks to Dale for sending = me the chart with "funny" baud rates not mentioned in HP's official = guide. Have a nice day, Vitaliy -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics