相关疑难解决方法(0)

我正在尝试学习汇编并编写引导程序.以下代码将软盘驱动器的内容加载到内存并跳转到它(开始在地址0x1000加载).此代码应该在屏幕上打印"X",但由于某种原因,它会打印一个空格.有人可以告诉我有什么问题吗？

[bits 16]
jmp reset
reset:          ;Resets floppy drive
    xor ax,ax   ;0 = Reset floppy disk
    mov dl,0        ;Drive 0 is floppy
    int 0x13
    jc reset        ;If carry flag was set, try again

    mov ax,0x1000   ;When we read the sector, we are going to read address 0x1000
    mov es,ax       ;Set ES with 0x1000

floppy:
    mov ah,0x2  ;2 = Read floppy
    mov al,0x11 ;Reading one sector
    mov ch,0x0  ;Track 1 
    mov cl,0x2  ;Sector 2, track 1
    mov dh,0x0  ;Head 1
    mov …