I have reviewed all of the posts for the serial handler for the low level I/O functions related to getkey(), putchar(), etc, and nobody has yet to hit the nail on the head. On page 293 of the 8051 users manual it refers to the module getch.c in the sources directory containing model version of all console I/O routines. I cannot find that directory in my "full" installation of Hi-Tide and version 9.01 of te 8051-c compiler. What I am looking for, if it is posible, is the existing source code used to implement console I/O functions so that I may see how it works and modify it to work with the serial port, maybe even interrupt driven. I envision that I will probably have to use the librarian to replace the existing objects in the library with the ones that I create. Any help and/or advice would be appreciated.