I was going to build the EPROM/RAM board this weekend but I noticed that there are several versions of the board. Mine says “4213” by the UL designation in the upper-left corner and has “Version 01” in the lower-right corner. It also has a coin cell battery holder on it.
This version doesn’t match any of the pictures on the Web site so before I built it, I wanted to confirm it was a good version. If not, I guess I should get another one from Ed Snider (I think).