Ch 03: Branching, Loops and Program Flow

Similar to how multi-word addition with carry is performed using ADC, which assembly instruction performs multi-word subtraction with borrow?

sub ax, cx
sbb bx, dx

Is the statement true or false: 'The JA (Jump if Above) instruction CANNOT be taken after a CMP instruction if the unsigned destination operand is greater than the source operand'?

cmp ax, bx
ja dest_greater

In 8088 real mode architecture, conditional jump instructions can only execute which type of jump?

jz short_label

When the divisor operand of a DIV instruction is 16 bits wide, where is the implied 32-bit dividend stored prior to division?

div bx

When a 16-bit dividend is divided by an 8-bit divisor using the DIV instruction, where must the 16-bit dividend be placed prior to execution?

mov ax, 100
mov bl, 5
div bl

When a 32-bit dividend stored in register pair DX:AX is divided by a 16-bit divisor using the 'DIV' instruction, what is the bit-width of the resulting quotient stored in register AX?

div bx

When a 16-bit dividend in register AX is divided by an 8-bit divisor using the 'DIV' instruction, in which register is the quotient stored?

div bl

If register AX contains decimal -2 (0xFFFE in 16-bit two's complement) and register BX contains decimal 2 (0x0002), what will happen upon executing 'CMP AX, BX' followed by 'JA label'?

mov ax, -2
mov bx, 2
cmp ax, bx
ja label