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
=== 8255 PIO Port B Input=== {|{{Prettytable|width: 700px; font-size: 2em;}}|7 ||Cassette data read (identical to CPC)|-|6 ||Centronics/Printer Busy (identical to CPC)|-|5 ||/EXP (identical to CPC)|-|4 ||1 (+5v)|-|3 ||1 (+5v)|-|2 ||0 (0v)|-|1 ||/TEST|-|0 ||VSYNC (identical to CPC)|-|}
=== Z8536 CIO ===