gistfile1.js

var af = bc = de = hl = ix = iy = 0;

self.registers = (function() {
	var self = this;
	var af_ = bc_ = de_ = hl_ = ix_ = iy_ = 0;
	var i = r = 0;

	var masks = {
		'af': 0xFFFF,
		'bc': 0xFFFF
	};
	
	for(var register in masks) {
		self[register.toUpperCase()] = function(value) {
			if (typeof value !== 'undefined') 
				window[register] = value & masks[register];
				
			return window[register];
		}
	}
});