Hello, I have been using my TiniDS80C400 board with the Keil uVision system and their monitor, until now I have not been calling the init_rom (0, 0) function, but now I need to as I am starting to use the libraries. Problem is when the Mon390 calls the init_rom() function it crashes/stops responding. I do have MONITOR.. defined in main.c. Any help will be appreciated Thanks.