That external ROM board can be a pain in the ass. On my 1977 Stern "Pinball", this board is mounted directly above the knocker! Lots of cracked solder joints (everywhere!) that needed reflowing. I knew that Stingray uses the same Roms as "Pinball" but I wasn't aware that Stingray was also using that same external ROM board (complete with "Pinball" labels on chips). Very cool!