K2616 info search

I am searching for the manuals to this old velleman interface system for sinclair zx81 and spectrum

K2616 being the zx81 version only differs in several components ( as 2615 and 2616 is the same pcb )

i have 3 manuals available k2615 , k2610 , k2618 .

any manuals for the other K26xx are welcome