There's a communications add-on for the TDS210 scope that adds rs232, parallel, and hpib interfaces for communications with printers and computers. I'd like one for my 210, but it's $350 MSRP, and I'd probably only use the rs232 port. I don't suppose that there are any third-party equivalents with less functionality at a lower price (or even (gasp) something modern like USB?) I took a quick google around and didn't see anything, or any specs on the interface for that matter. I guess tektronix keeps it pretty proprietary? Sigh. Seems like a good application for one of those USB 18F PICs... BillW -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist