The second Newton device to be released by Apple. The MessagePad 100 shared the same model number (H1000) and form factor as the Original MessagePad. but was less expensive and shipped with a newer version of Newton OS in ROM.
The code names for the MessagePad 100 were Wedge and Junior. The MessagePad 100 is commonly referred to as an MP100.
Internet Archive: Newton MessagePad 100: Description
Internet Archive: Newton MessagePad 100: Specifications