I want to monitor the bi-directional messages on an SPI interface and record them. As an example from the RS232 environment, I have used an HP (Agilent) protocol analyzer to show asynchronous, bi-directional messages. (In one of the modes, the 'to' characters displayed in 'white on black' on the even-numbered lines and 'black on white' on the odd-numbered lines.) The operator had the option to save the information to diskette, which could then be inserted into a PC. I last contacted Agilent about an equivalent product for Microwire about three years ago. At that time they did not offer such a product. My current options are to build or buy. (We could build one here, but I would prefer to buy.) Thanks, Doug Hewett Software engineer -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.