Hi, I recently purchased the DK900 Developement kit from http://eu.st.com/stonline/prodpres/memory/psd/html/dk900bd.htm I was able to compile and run the samples, but I am having trouble trying to add to the existing projects. I added putch() for printf(), so that works. Now, when I add files to the project to get user input and display a menu. It compiles just fine, but the display is messed up, indicating something is wrong. I have no idea what it could be? I've never messed with Startup.A51 till now. They do some memory swapping in Startup.A51 I am wondering why PSDload() and PSDload_Init() in Startup.A51? EXTRN CODE(PSDload_init, PSDload) LCALL PSDload_init LCALL PSDload EXTRN CODE(psd_init) I have a function called DoLoop(), which just loops getting input, then display a menu and run some other function. I tried to swap PSDload and DoLoop in Startup.A51, but that doesn't seem to work either. Any idea what I am doing wrong? Thanks for your help,