Habi-Soft Wiki:
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https://www.habisoft.com/pcwwiki/doku.php?id=en:hardware:perifericos:pcw-io

Circuit-Board Wiki:
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https://circuit-board.de/forum/index.php/Thread/19165-TL866-Wie-beschreibt-man-PICs/

=> TL866A - Wie beschreibt man einen PIC ?

CPC-Wiki:
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https://www.cpcwiki.eu/forum/nc100-nc200-pcw-pda600/pcw-8xxx-that-has-problem-with-keyboard-signal/
