Newton Glossary

An almost definitive guide to Newton-related terms and trivia.


The code name of the larger, unreleased MessagePad device also known as the Newton Plus. The debugger ROM for the MessagePad 2000 and MessagePad 2100 devices was referred to as the “Senior Cirrus Debug”, perpetuating the theory that the Newton Plus actually existed and ended up being developed as the MessagePad 2000.


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