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assume cs:code
data segment
db 512 dup (0)
data ends
code segment
start:
mov ax,cs
mov ds,ax
mov si,offset bootstart
mov ax,data
mov es,ax
mov di,0
mov cx,offset bootend - offset bootstart
cld
rep movsb
jmp write
bootstart:
jmp short boots ;问题A
db 10 dup (0)
boots:
mov ax,cs ;问题B
mov ss,ax
mov sp,10
mov ax,0
mov es,ax
mov bx,7c00h
mov al,1
mov ch,0
mov cl,2
mov dl,0
mov dh,0
mov ah,2
int 13h
mov bx,0
push bx
mov bx,7c00h
push bx
retf
bootend: nop
write:
mov ax,data
mov es,ax
mov bx,0
mov al,1
mov ch,0
mov cl,1
mov dl,0
mov dh,0
mov ah,3
int 13h
mov ax,4c00h
int 21h
code ends
end start