NC100 Advanced Guide

The NC100 Built-In Assembler is a powerful tool that enables you to write assembly programs directly on the NC100 through the BBC Basic editor.
Here is an overview of the NC100's Memory Map. Be sure to read the sections about system variables, using the LCD and the system variables.
Brief explanation of the I/O Ports in the NC100 and their functionality.
Guide to direct access of the NC100's LCD display.
List of System- and Basic variables with brief explanation.
A complete list of firmware functions and explanation on how to use them.
The undocumented Memory Dump functionality of the built-in Protext Command Mode.
The Amstrad NC100 Advanced User Guide. Most os the above information is taken directly from here.