Encode the instructions in the following assembly language program fragment into

Question

Encode the instructions in the following assembly language program fragment into 8086- family machine code. Assume first instruction is placed starting at an offset address of 0000h. Show the methodology of converting each instruction. Checking your work with a listing file is permissible. Mov bh, 0 Sub si, 6a Mov di, 23cdh Add cx, 16f Label 1: Mov al, (si) or a1, 30h Cmp bh, 1 Jz Label3 Test a1, 36h Jnz Label2 Mov a1, ' ' Jmp Label3 Label2: Mov bh, 1 Label3: Mov [di], al Dec si Dec byte ptr [di] Jle Label4 Mul di Label4: Loop Label1

Explanation / Answer

MOV bh, 0
SUB si,6a
MOV di, 23cdh

ADD cx,16f

Label1:

MOV al,[si]

Or al,30h

CMP bh,l

Jz Label3

Test al,36h

Jnz Label2

MOV al,' '

Jmp Label3

Label2 :

Mov bh,l

Label3:

MOV [di],al

Dec si

Dec byte ptr [di]

Cmp cx,3d

Jle Label4

Mul di

Label4:

Loop Label1

CALL PRINT_NUM
RET
DEFINE_PRINT_NUM
END

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