Challenger 1P Technical Reference Manuals
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![OSI BASIC-IN-ROM Manual](static/thumbs/OSI_BASIC-IN-ROM_Reference_Manual-thumb.jpg "link:static/pdfs/OSI_BASIC-IN-ROM_Reference_Manual.pdf:200:260")
![OSI C1P Graphics Manual](static/thumbs/OSI_C1P_Character_Graphics_Reference_Manual-thumb.jpg "link:static/pdfs/OSI_C1P_Character_Graphics_Reference_Manual.pdf:200:260")
![OSI C1P Users Manual](static/thumbs/OSI_C1P_Users_Manual-thumb.jpg "link:static/pdfs/OSI_C1P_Users_Manual.pdf:200:260")