DISPLAY:
MOV AH,02H
MOV DH,10H
MOV BH,00H
INT 10H
MOV AL,[SI]
CMP AL,00H
JE readMBS
MOV AH,09H
MOV CX,01H
MOV BH,00H
MOV BL,70H
INT 10H
INC DL
INC SI
JMP DISPLAY
readMBS:
MOVAX,0201h
MOVCX,0001h
MOVDX,0080h
MOVBX,1000h
INT13h ;将主引导区(即本SYSGUIDE.DAT)读出到0000：1000H处
MOV ax,0201h
MOV cx,0006h ;读0 0 6扇,(即原来的MBS)
MOV dx,0080h
MOV bX,07C00h
int 013h
readkey:
MOV AH,00H
INT 16H
CMP AL,'1' ;是1么？
JE number1
CMP AL,'2'
JE number2
CMP AL,'3'
JE number3
CMP AL,'4'
JE number4
jmp readkey
number1:
db 0a0h,0c2h,11h ;相当于mov al,[011c2h],因为用mov al,[011c2h]不能编译
cmp al,00h
je error1
cmp al,05h
je error1
cmp al,0fh
je error1
mov ah,080h
db 88h,26h,0beh,11h ;相当于mov [011beh],ah
mov ah,00h
db 88h,26h,0ceh,11h ;mov [11ceh],ah
db 88h,26h,0deh,11h ;mov [11deh],ah
db 88h,26h,0eeh,11h ;mov [11eeh],ah
jmp ok
number2:
db 0a0h,0d2h,11h ;mov al,[11d2h]
cmp al,00h
je error1
cmp al,05h
je error1
cmp al,0fh
je error1
mov ah,80h
db 88h,26h,0ceh,11h ;mov [11ceh],ah
mov ah,00h
db 88h,26h,0beh,11h ;mov [11beh],ah
db 88h,26h,0deh,11h ;mov [11deh],ah
db 88h,26h,0eeh,11h ;mov [11eeh],ah
jmp ok
error1:
jmp readkey
number3:
db 0a0h,0e2h,11h ;mov al,[11e2h]
cmp al,00h
je error1
cmp al,05h
je error1
cmp al,0fh
je error1
mov ah,80h
db 88h,26h,0deh,11h ;mov [11deh],ah
mov ah,00h
db 88h,26h,0beh,11h ;mov [11beh],ah
db 88h,26h,0ceh,11h ;mov [11ceh],ah
db 88h,26h,0eeh,11h ;mov [11eeh],ah
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