Joe, I worked at Hayes for 3 years, but don't remember this modem, so I emailed some friends of mine who were there before me. Jeff seems to recall there were two government model modems (although I only found part numbers for one). One was basically just a sticker that proclaimed it to be for government use only, and did nothing special. The other version has an empty chip socket intended for a WD2003A DES chip. There may be some extra AT commands that set an encryption key. If so, the data from the serial port would be encrypted before being pushed out to the modem chipset. Jeff recalls writing code to test the chip, but doesn't recall anyone actually writing code to support it, although he wasn't sure how we'd pawn it off on a customer if we didn't have support for it. Sorry I can't find any more information on it. I talked to Dale Heatherington, who said he was gone after that came out, and Jeff Inskeep, who was there until the lights were turned off. He had a hand in almost every product designed after the S-100 mode (SB-103, maybe?) and Smartmodem 300. --jc Joe R. wrote: