To Paul: Thanks for the response to my post; and likewise for the other responses and your offer to head's-up here your next run of boards. If you have insights into USB/serial buffering issues, you can contact me privately c/o retrotechnology.com. (I follow the VCFed list by Web, so I don't see private email addresses for private contacts.) - Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net