Hello! My company is still using the old DOS software Ver 9.0 to troubleshoot a PIC 900 ( model 918??? cpu ) plc. I am tring to talk them into upgrading to the windows version but have been told that the windows version was not tested on this model cpu and we will have to upgrade the cpu processor. Our laptop is old and tring to find a laptop that will still run a DOS program and has a serial port is getting scarce. Anyone know of or that has used the windows version with this processor. Thanks Bob