The MessagePad 2000 is based on the StrongARM 110 processor, making it nearly ten times as fast as its predecessor, the MessagePad 130. It also featured significantly more RAM, a slightly larger greyscale screen, support for two PCMCIA cards, and the proprietary multifunction Newton Interconnect port.
When an MessagePad 2000 has been upgraded to the equivalent specifications of a MessagePad 2100, it becomes an UMP or “Upgraded MessagePad”. A non-upgraded MessagePad 2000 is also referred to as an Original MessagePad 2000 or OMP2K.
Like its successor, the MessagePad 2100, the MessagePad 2000 was code named Q. It is commonly referred to as an MP2000.
Internet Archive: Press Release: Apple Ships MessagePad 2000