bootstrap.asm

调用bios中断打印helloworld并输出显示时钟

.MODEL TINY
.386
.code
	
	JMP START				
	
	;字符串常量
	string DB 13,10,'Hello world!'
	
	;读取光标当前位置,DH=row,DL=column
	READ proc
			MOV AH,03H
			XOR BH,BH
			INT 10H
			RET
	READ ENDP


START:
	MOV AX,07C0H
    MOV DS,AX
    
    ;打印字符串
	MOV ES,AX
	MOV AX,OFFSET string
	MOV BP,AX
	CALL READ
	MOV AL,01H
	MOV CX,16
	XOR BH,BH
	MOV BL,41H
	MOV AH,13H
	INT 10H
END START