hello and thanks for taking the time. i did search the archives first. i am trying to convert an old forth interpreter called eForth17 from asm17 to mpasm. this is my first time seeing pic assembly language. it is the forth language for the 17C42. it compiles and i can debug it. here is my problem. eforth17 writes to and reads from the serial port. it excepts a interactive user at a terminal. how can i simulate/debug a program in mplab that needs interactive user input? thanks, dave