boot.asm

简易操作系统

	org	07c00h			; 告诉编译器程序加载到7c00处
	mov	ax, cs
	mov	ds, ax
	mov	es, ax
	call	DispStr			; 调用显示字符串例程
	jmp	$			; 无限循环
DispStr:
	mov	ax, BootMessage
	mov	bp, ax			; ES:BP = 串地址
	mov	cx, 16			; CX = 串长度
	mov	ax, 01301h		; AH = 13,  AL = 01h
	mov	bx, 000ch		; 页号为0(BH = 0) 黑底红字(BL = 0Ch,高亮)
	mov	dl, 0
	int	10h			; 10h 号中断
	ret
BootMessage:		db	"Hello, OS world!"
times 	510-($-$$)	db	0	; 填充剩下的空间，使生成的二进制代码恰好为512字节
dw 	0xaa55				; 结束标志

139A:0100 db 11
139A:0101 mov BP,0100
139A:0104 mov CX,0002
139A:0107 mov AX,1301
139A:010A mov BX,000C
139A:010D mov DL,00
139A:010F int 10h
139A:0111

-a 139A:0100
139A:0100 DB "DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD"
139A:0120 MOV BP,0100
139A:0123 MOV CX,0022
139A:0126 MOV AX,1301
139A:0129 MOV BX,000C
139A:012C MOV DL,00
139A:012E INT 10H
139A:0130


a 139A:0100
MOV AX,1201
MOV BX,000C
MOV DL,00
INT 10H
p=139A:0100