push ds
sub ax,ax
push ax
****寄存器进栈
pushseg macro
push ax
push bx
push cx
push dx
push si
push di
endm
****寄存器出栈
popseg macro
pop di
pop si
pop dx
pop cx
pop bx
pop ax
endm
****DOS中断21H
dos21 macro nh
mov ah,nh
int 21h
endm
****接收字符串
getchar macro inbuf,length
lea dx,inbuf
mov ah,0ah
int 21h
mov cx,length
mov bh,0
mov bl,inbuf+1
sub cx,bx
getchar1:
mov [bx+inbuf+2],20h
inc bx
loop getchar1
getchar endm