You need COMM software. As I recall you need software that will take your program and turn it into Binary code correct? and you might have to do it in DOS also. You can find comm software on the internet as free download. I will do a search for it and see what I can find. What will work is "Pro Comm" or "Pro Comm Plus". You will have to get your baud rate set and stop bit rate and comm channel and port settings. Check your machine manual for those settings. Good Luck..