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)
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|6||Centronics/Printer Busy (identical to CPC)
|-
|5||/EXP (identical to CPC)
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|4||1 (+5v)
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|3||1 (+5v)
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|2||0 (0v)
|-
|1||/TEST
|-
|0||VSYNC (identical to CPC)
|-
|}
=== Z8536 CIO ===