Upgrade Mk3 to Mk4
The upgrade from a Mk3 system to a Mk4 system is straight forward.
The plugs and sockets are the same on both units so it is only a matter of removing one and plugging in the other.
My pages are for the occasional curious visitor. You might find something of interest.
I deposit some of my accumulated random material here in case it is of use to anyone else. Good luck and have fun!