Intel MB820 user manual Out dx, al

INSTALLATIONS

;Name : Unlock_Chip

;IN : None

;OUT : None ;[]===============================================

Unlock_Chip Proc Near

mov	dx, 2Eh
mov	al, 87h

out dx, al out dx, al ret

Unlock_Chip Endp ;[]================================================

;Name : Lock_Chip

;IN : None

;OUT : None ;[]================================================

Unlock_Chip Proc Near

mov	dx, 2Eh
mov	al, 0AAh
out dx, al
ret
Unlock_Chip	Endp

;[]================================================

;Name : Write_Reg

;IN : CL - register index

;AL - Value to write

;OUT : None ;[]================================================

Write_Reg Proc Near

push ax

mov		dx, 2Eh
mov		al,cl
out dx,al
pop ax
inc	dx
out dx,al
ret
Write_Reg	Endp

;[]================================================

MB820 User’s Manual 25