* The keyboard matrix of the KC compact supports all the keys of the CPC, but the following keys are not on the keyboard: F5, F6,F7,F8,F9.
* The KC Compact has a power LED (near CLR key). There are also (unused) locations for two additional LEDs (near TAB/CAPS key) , eventually these locations are used by the D005 keyboard for KC-85 computers, or by the Robotron A5105 computer (both D005 and A5105 use the same case & keyboard as the KC Compact, aside from that, they have nothing to do with it).
== KP580BB55 PIO (equivalent to 8255 PPI) ==