The last Newton device released by Apple through their Newton Inc. subsidiary. It shared the same specifications as its predecessor, the MessagePad 2000, with the exception of an increased amount of system memory. A MessagePad 2000 device can been upgraded to the equivalent of a MessagePad 2100 by increasing the total amount of RAM from 5MB to 8MB.
Like its predecessor, the MessagePad 2100 was code named Q.
It is commonly referred to as an MP2100.
Internet Archive: Press Release: Apple’s New MessagePad 2100
Internet Archive: MessagePad 2100 Product Information
Cult of Mac: Newton MessagePad makes its last stand