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disk_load :
push dx ; Store DX on stack so later we can recall
; how many sectors were request to be read ,
; even if it is altered in the meantime
mov ah , 0 x02 ; BIOS read sector function
mov al , dh ; Read DH sectors
mov ch , 0 x00 ; Select cylinder 0
mov dh , 0 x00 ; Select head 0
mov cl , 0 x02 ; Start reading from second sector ( i.e.
; after the boot sector )
int 0 x13 ; BIOS interrupt
jc disk_error ; Jump if error ( i.e. carry flag set )
pop dx ; Restore DX from the stack
cmp dh , al ; if AL ( sectors read ) != DH ( sectors expected )
jne disk_error ; display error message
ret
disk_error :
mov bx , DISK_ERROR_MSG
call print_string
jmp $
; Variables
DISK_ERROR_MSG db " Disk read error !" , 0
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