Ian Bell wrote:

I am surprised there has been so little development of cartridges beyond the
two basic magnetic types and good old ceramic. What about an optical
cartridge for example?

Ian

I've wondered about that! If you take the electronics that is currently
used to read where a microsoft optical mouse is on its surface, give its
microcontroller a short sharp reprogramming session, and hang the whole
caboodle off a linear tracking arm, it would work?

University final year project for some lucky student reading this!

--
Adrian C