I have a Iie enhanced and a iigs. Both machines have z80 cards. One genuine Ms, one a clone.
I read ages ago about running the z80's at a higher clock rate , and a recent search found this link :
Which I think is speedyg's site. No doc there at present.
Can someone advise please if such a mod is possible, is it worth it and how to do so? Each of my apples is otherwise stock, ntsc machines (being used in UK)