Hiall, We are trying to get MON51/dScope running on an ASIC with an embedded DW8051. We are NOT running the device in Von Neumann Mode. We are using the Dw8051's support for writing to the program RAM space. (It has an SFR for directing XDATA write to program space) We have modified the WR_CODE function in the INSTALL.A51 for MON51 to perform this. We cannot run the deice in Von Neumann mode, we have too much code and not enough XDATA ram. We are able to boot MON51, establish serial communications with it, down load our code (hence verifying our WR_CODE support works). But, we are unable to set breakpoints. Does anyone have experience of using MON51 on this device? If so, are there other modifications that we need to make to MON51 based code to make it work? Thanks, Mark