via this listing
"Good condition EZ-CZ RAM Cartridge for cz synths. New batteries. Tested, Works fine. Includes box and insert from it's original sale.
Originally it had patches from 'Synthetic Productions' , 1986. Synthetic Productions is the guy who wrote the Casio CZ book. I was dismayed to find this cart with no batteries in it, and no patches on it. On the positive side, there is no battery damage."
