assume cs:code 

stack segment
	dw 100 dup(0)
stack ends

code segment	
start:	
		mov ax, stack
		mov ss,ax
		mov sp,100
		
		mov ax,code
		mov es,ax
		mov bx,offset shanqu1
		
		mov al,1
		mov ch,0
		mov cl,1
		mov dl,0
		mov dh,0
		mov ah,3
		int 13h
		
		mov ax,code
		mov es,ax
		mov bx,offset shanqu2
		
		mov al,2
		mov ch,0
		mov cl,2
		mov dl,0
		mov dh,0
		mov ah,3
		int 13h

		
		mov ax,4c00h
		int 21h

shanqu1:
		mov ax,0
		mov es,ax
		mov bx,200h
		
		mov al,2
		mov ch,0
		mov cl,2
		mov dl,0
		mov dh,0
		mov ah,2
		int 13h
		
		mov ax,0
		mov ds,ax
		mov bx,200h
		jmp dword ptr [bx]
		
shanqu1end:nop

shanqu2:
	
	assume cs:code1
	
	data1 segment
		str1 db '1) reset pc',0
		str2 db '2) start system',0
		str3 db '3) clock',0
		str4 db '4) set clock',0
	data1 ends

	stack1 segment
		dw 100 dup(0)
	stack1 ends
	
	code1 segment

	start1:	
			mov ax, stack1
			mov ss,ax
			mov sp,100
			
			mov dh,10;显示的行号
			mov dl,15;显示的列号
			mov cl,4ah
			mov ax,data1
			mov ds,ax
			mov bx,offset str1
			call show_str;调用显示字符串函数
			mov dh,11;显示的行号
			mov dl,15;显示的列号
			mov cl,4ah
			mov ax,data1
			mov ds,ax
			mov bx,offset str2
			call show_str;调用显示字符串函数
			mov dh,12;显示的行号
			mov dl,15;显示的列号
			mov cl,4ah
			mov bx,offset str3
			call show_str;调用显示字符串函数
			mov dh,13;显示的行号
			mov dl,15;显示的列号
			mov cl,4ah
			mov bx,offset str4
			call show_str;调用显示字符串函数
	
		;显示字符串函数\/
			show_str: 
				push ax
				push bx
				push cx
				push dx
				push es
				push si
					push cx
				mov al,160
				dec dh
				mul dh
					push ax
				mov al,2
				dec dl
				mul dl
					pop si
				add si,ax
				mov ax,0b800h
				mov es,ax
					pop dx
				
				mov ch,0
				;pop si
				
			s:	mov cl,ds:[bx]
				jcxz ok
				mov al,ds:[bx]
				mov es:[si],al
				mov es:[si+1],dl
				inc bx
				add si,2
				jmp short  s
				
				ok: 
				pop si
				pop es
				pop dx
				pop cx
				pop bx
				pop ax
				ret	
	;显示字符串函数^
	
	code1 ends
	end start1

shanqu2end:nop

code ends		
end start

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