nl_tokens: clears the entire display
pl_tokens: function clearDisplay ( addr ) { if ( addr < 0 || addr >= maxDevices ) throw 'address out of range' ; var offset ; offset = addr * 8 ; for ( var i = 0 ; i < 8 ; i ++ ) { status [ offset + i ] = 0 ; spiTransfer ( addr , i + 1 , status [ <mask> + i ] ) ; } }