I recently completed a PCB layout for a serial board for the TRS-80 PT210 printing terminal. The primary intended means of connecting to a host to this is an accoustic coupling modem. If you want to use RS232 serial, you need an optional board. These boards have since become very hard to find, so I used the info I found in the service manual to make my own. See http://batchpcb.com/index.php/Products/59707 to get your own made. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?