Quoted from CactusJack:I laid out a NVRAM version that will work with System 1 MPU boards. Wayne at Pinitech has a few of them available if you contact him directly (he doesn't have them on his website).
I'll have some of the Gottlieb System 1 NVRAM Modules built up early this week and get them available on the shopping cart. Behind on where I expected to be after getting rocked by a cold right after the New Year... finally 100% and getting my stamina back. What a pain. Life happens