I know this will probably be a stupid question, but, how do you change the data in the 'w' register when using MPLAB in software simulation mode. I can change any ram/file address using the modify window (enter the address then the value and click on Write) but when I try to change the w register it remains unchanged (entering 'w' as the address, etc). I have tried what I think are all combinations without success. Thanks ----- Stephen H Alsop ----- email: s.ssystems@easynet.co.uk www : http://easyweb.easynet.co.uk/~s.ssystems S&S Systems Ltd, Bretton Court, Manor Road, Wales Village, Sheffield S31 8PD, England. Tel: 01909 773399 * Fax: 01909 773645