Question $20$

Find the content of $Ax$ and the status of the $CF,PF,AF,ZF$ and $SF$ after the execution of the

following instructions?

SUB AX$,$ AX

SUB AX$,1$

PUSH AX

POPF ; it is mean POP into Flag registers

a$.Ax=FFFFH,CF=0,PF=1,AF=1,SF=1,ZF=0$

b$.Ax=0000H,CF=1,PF=1,AF=1,SF=1,ZF=1$

c$.Ax=FFFFH,CF=1,PF=1,AF=1,SF=1,ZF=1$

d$.Ax=0001H,CF=1,PF=0,AF=1,SF=0,ZF=1$