If it's of any use, QB utilities I wrote 20+ years ago work on Virtual PC 2007 inside XP, running DOS 6.22. Serial/Parallel port accesses no problems, so far. You need to have parallel/serial port card(s), of course. Jack -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist