Hi, I want to change some things in the I/O ports. $600015. But i dont want to change all bits. What is the most used way to do this? Set all individual bits? AND all bits to be reset with 0 and OR the bits to be set with 1? Or should I just move a byte over there? I'don't know if that's safe, because the meaning of bit 6 is not well defined: 6: -(HW2:?) Bye Cheiz