Hi, I have just started using your uvision2. I received your tool when I bought the phillips development system. Here's my problem: I am targeting a philips 764 controller, this is a 8051 compatible, all code was written in assembly language. When I go to build an existing file which used the 'b' register I get the following error error A48: DATA-ADDRESS EXPECTED the line of the code it is issuing this error for is below clr b Thanks, John