3. A system as claimed in claim 1 wherein said analyzer means comprises: an availability matrix receiving said second group of signals from said decoder means for providing a third and fourth group of output signals, a status register for receiving said fourth group of output signals from said availability matrix and said first group of signals from said decoder means, said status register providing a plurality of output signals, and an analyzer module for receiving said third group of signals from said availability matrix and said plurality of output signals from said status register, said module providing said further coded representations to said combining means.
3. A system as claimed in claim 1 wherein said analyzer means comprises: an availability matrix receiving said second group of signals from said decoder means for providing a third and fourth group of output signals, a status register for receiving said fourth group of output signals from said availability matrix and said first group of signals from said decoder means, said status register providing a plurality of output signals, and an analyzer module for receiving said third group of signals from said availability matrix and said plurality of output signals from said status register, said module providing said further coded representations to said combining means. 6. A system as recited in claim 3 wherein said input means comprises a keyboard.