Running NT and Keil V2.06. My app includes <string.h> because it calls memcpy. Compile and link w no errors or warnings. As soon as I hit the debug icon, I get a "uv2.exe - Application Error" window: "The instruction at '0x004771ad' referenced memory at '0x00000000'. The memory could not be read. Click on OK to terminate the application. Click on CANCEL to debug the application.'" Thanks, Doug Hewett software engineer startrac