Daughter board of CP/M Turbo 7

I'm considering make a sub board for CP/M Turbo 7 card.

There are some types could be made.....

Sound card

-It would be a good one but, we have mocking board and it is no worthy to make..

too much similar one.

RAM card

-RAM card would be good one for Z80 but, I'm wonder that what application or software could use it.

If not MSX card, it isn't useful...

PIO card

-I personally like to play PIO.. ON/OFF LED.. looks good. 

ON relay and turn ON some of electric device would interesting..

But, it is easy for me... not interesting to me..

Video card

-Video card would be very interesting one. but, it isn't easy for driving...

Sprite card would be used to emulate some of old computer...

And it it possible to use by APPLE ][ not only Z80 board..

Video card would be a good board for CP/M Turbo7.

Ok, Go for a VDP board.

It would be a interesting project and could be used for sprite on APPLE II.

Here is draft board.

I have to order PCB for this..

Keep watching what I'm doing..  :)

Ian Kim