assume cs:code,ds:data,ss:stack

data segment
                db 'welcome to masm!'
                db 71h,24h,02h                                                                                
data ends

stack segment
                dw 8 dup (0)
stack ends
      
code segment
                start:
            mov ax,data
                mov es,ax                                        ;ES在字符串上
                
                mov ax,0b800h                                
                mov ds,ax                                        ;DS指向显卡段
                
                mov bx,0        ...

assume cs:code

data segment
                db 'conversation',0
data ends

code segment
                start:
                mov ax,data
                mov ds,ax
                mov si,0
                mov cx,2
                call capital
                 
                mov ax,4c00h
                int 21h
        
                capital:
                mov cl,[si]
                mov ch,0
                jcxz ok
                and byte ptr [si],11011111b
                inc si
                jmp short ca...