A.MOVBX,VAR B.LDSBX,VAR C.LESBX,VAR D.LEABX,VAR
A.TESTAL,02H B.ORAL,AL C.CMPAL,BL D.ANDAL,BL
A.MOVCS,AX B.MOVDS,AX C.MOVSS,AX D.MOVES,AX