All that hex data form (those compiled numbers) I think they are orginised into 8 bytes a line and every 8 numbers makes 1 byte. I think it take up more memory in the calc since in is not in electronic (I/O) format. Does anyone know how the calculator converts this low level machine code into an on/off (I/O) or low high signal and why does it have three pins in the linkport? I am refering to the TI-83. Thanks. From: Chris mecad@scv.net