Challenger 1P Datasheets
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![MC6820](static/thumbs/MC6820-thumb.jpg "link:static/pdfs/MC6820.pdf:200:260")
![MC6821](static/thumbs/MC6821-thumb.jpg "link:static/pdfs/MC6821.pdf:200:260")
![MC6850](static/thumbs/MC6850-thumb.jpg "link:static/pdfs/MC6850.pdf:200:260")