KrnSystemTickIsr:
	cli
	push eax
	
	in al, 20h ;;spurious ISR check
	test al, 80h
	jz .isspurious
	
		inc dword [systemtick]
		;;;;;;insert code here
	
	.isspurious:
	
	mov al, 20h    ;;;;nonspecific EOI (specific = 60h!)
	out 20h, al    ;;;;send to the slave too for the other isrs > 7!
	
	pop eax	
	sti
	iret