|}
(note* Note: A8 is passed through an inverter and this describes the order of the registers , resulting in the table compared above ''B,C,Control,A'' ordering (this is done to map Port A to the order of same address as the registers in CPC Printer Port) (without the inverter, CIO datasheetregisters would have ''C,B,A,Control'' ordering).
On start-up, the KC compact programs the CIO to the following state:
