User manual

35 Chapter A
;----------------------------
mov al, 60h
mov dx, 2Eh
out dx, al
mov dx, 2Fh
in al, dx
shl al, 8
mov al, 61h
mov dx, 2Eh
out dx, al
mov dx, 2Fh
in al, dx
; now, AX contains the base address
mov bx, ax ; save base address in BX
;----------------------------
; exit configuration state
;----------------------------
mov dx, 2Eh
mov al, 0AAh
out dx, al
;----------------------------
; select WDT configuration
;----------------------------
mov dx, bx
add dx, 67h
in al, dx