Newton MessagePad Handbook
https://macintoshgarden.org/apps/newton-messagepad-handbook
This is an edition of the MessagePad handbook, the user's manual for the Newton MessagePad. Which hardware and which version of the OS it refers to appears to be unstated. Its Apple part number is
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@macgarden MessagePad 1xx series, certainty from the battery slot. From screen shots, NewtonOS 1.x too
