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fix keyboard (T.Yui)

vect09:			sti
				push	ax
				push	ds
				in		al, 0x43
				test	al, 0x38
				jne		short .err
.force:			mov		al, 0x16
				out		0x43, al
				mov		byte [0x0529], 0
				in		al, 0x41
				call	bios09
.eoi:			mov		al, 0x20
				cli
				out		00h, al
				pop		ds
				pop		ax
				iret
.err:			push	ds
				xor		ax, ax
				cmp		byte [0x0529], 3
				jae		short .force
				inc		byte [0x0529]
				mov		al, 0x14
				out		0x43, al
				in		al, 0x41
				jmp		short .eoi