Hi, Lance, *********** REPLY SEPARATOR *********** On 26-Oct-03 at 01:27 Axel L?rchner wrote: The 29A does not depend on any sort of external software. Like its later successor, the 29B, it is fully operable by its on-board keypad. The only thing you'd use the serial port for is to transfer files to and from the unit. To know how to do that, your best bet is to track down a technical manual on the 29 series, because Data I/O used their own custom handshaking and protocol. The only programmers from Data I/O that have a built-in menuing system, for use with a 'dumb' terminal or PC, were the UniSite, 2900, 3900, and other such units that did not have a keypad. Some, such as the 'ChipLab,' require special software running under a DOS or Windows environment. Good luck. -=-=-=-=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- http://www.bluefeathertech.com ARS KC7GR (Formerly WD6EOS) since 12-77 -- kyrrin(a)bluefeathertech.com "Quando Omni Flunkus Moritati" (Red Green, aka Steve Smith)