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| Initial HP-41C Three Transistor | HP-41C Two Transistor | ||||||||
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| Final HP-41C | Initial HP-41CV | ||||||||
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| HP-41C/CV Common Board (CV version) | HP-41C/CV/CX Common Board (CX version) | ||||||||
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| HP-41C/CV Common Board (C version) | HP-41C/CV/CX Common Board (CV version) | ||||||||
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| HP-41C/CV/CX HalfNut | HP-41C/CV/CX Common Board (C version). Thanks to Allen. | ||||||||