[Principle references]
----------------------

Title:		The New Advanced User Guide
Subtitle:	for the BBC Master, Compact, B, B+ & Electron
Author:		Mark Holmes & Adrian Dickens
Publisher:	Adder Publishing Limited, Cambridge
ISBN:		0 947929 05 3

[other references]
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Ideas from:
BBC Emulator, Ian Stephenson. Based upon Apple ][ Emulator by Ben Koning

Stephen Youell has provided much discussion and input. In particular much
fruitful discussion on the memory system and speeding up zero page access.
