instructions
a -- ~a
NOT -> Pushes the bitwise not of byte a.
NOTw -> Pushes the bitwise not of word a.
NOTx -> Sets byte y to its bitwise not.
NOTxw -> Sets word yw to its bitwise not.
NOTy -> Sets byte y to its bitwise not.
NOTyw -> Sets word yw to its bitwise not.
NOTxy -> Sets bytes x and y to their bitwise not.
NOTxyw -> Sets word xw and yw to their bitwise not.