MASM-两个16位二进制数减法模拟

sp;jl  re2
        cmp al,''''1''''
        ja  re2

        mov num2[si],al
        inc si
        cmp si,16
        jl  n2roat

        mov bx,offset num1
        call questBuma
        mov bx,offset num2
        call questBuma
                TSOUT tsnum11;//
                TSOUT num1;//
                TSOUT tsnum22;//
                TSOUT num2;//

        call bsubproc
                 TSOUT tssum;       
                 TSOUT sum ;//test

        lea bx,sum
        call questBuma
                TSOUT tssum33;//
                TSOUT sum;//
        lea bx,sum
        call BinaryToHexAndOut
                TSOUT tssumhex;//
                TSOUT hexsum;//
;******************************
        mov ah,4ch
        int 21h
;*******************************************
questBuma proc near   ;功能:求补码
     ;算法:模拟求补码运算,如二进制求补码方法一致.
                   ;bx    ;bx作为参数,传入NUM1或NUM2内存空间首地址
        mov al,[bx+0]
        cmp al,''''0''''
        jz qbret   ;如果是正整数,函数返回;如果是负数,符号位不变,其余位取反加1.
        mov si,1   
qbroat:
        mov