A.XOR BX,01H B.OR BX,01H C.AND BX,01H D.TEST BX,01H
A.XOR CL,0FH B.NOT CL C.OR CL,0AH D.AND CL,0FH
A.OUT AX,30H B.OUT DX,AL C.OUT AL,DX D.OUT 30H,AH