I had the exact same problem last night. I discovered that even though I had told MPLAB to create the project in Simulator mode, it had actually created it in Editor Only mode. Go to Options->Development Mode and select MPLAB-SIM Simulator. MPLAB will close your current project, but when you reopen it, all the debug stuff will work. CIAO - Martin R. Green elimar@bigfoot.com ---------- From: Ravindra Divekar[SMTP:ravindra@HAL.COM] Sent: Thursday, July 31, 1997 9:17 PM To: PICLIST@MITVMA.MIT.EDU Subject: debug using MPLAB ? Hi friends! I tried using MPLAB to develop my software. I managed to Create a new project, add .asm files to the project and assemble it without errors. However I am unable to debug my project. When I go to the Debug menu, none of the choices are active (such as run,animate etc.). am i missing something here ? do i need to setup the environment in a different way, or is it justa keypress away ? --ravindra