Evelsy Vargas

Exercise 4.1 pag65

mov	ax,	0FFFFh  ;  = -1; ax=  FFFFh

inc	ax   ;		   ax = 0000h

mov	ax,     0FFFFh

inc	al   ;		   ax = FF00h

mov     ax,     1234h

sub     ax,     35h  ;     ax = 1234+FFCB = 11FFh

mov	ax,	1234h

sub	al,     35h  ;     ax = 12FFh (no borrow)

mov 	ax   ;  1234h

neg	ax   ;		   ax = EDCCh

mov     ax,     1234h

neg     al   ;		   ax = 12CCh

mov     ax,     1234h

mov	al,     -1 ;	   ax = 12FFh

inc	AX   ;             ax = 1300h

mov     ax,     12FFh;

inc	AL   ;		   ax = 1200h ( no carry)

mov	ax,     1200h

dec     AX   ;             ax = 11FFh

mov     ax,     1200h;

dec     AL   ;             ax = 12FFh

mov     ax,     1234h

sub     ax,     ax  ;      ax = 0000h

mov     ax,     1234h

sub     al,     al  ;      ax = 1200h