Quoted from hawknole:Dave, this is the "permanent battery" thing we were talking about tonight that I have in my BK. It says there are Gottlieb versions, wondering if anyone has tried one in their HH?
https://pinside.com/pinball/market/shops/1030-pinitech/00316-5101-nvram-battery-eliminator-for-high-score-save
The DUAL CE version will work in Haunted House or any other Gottlieb Sys80 game. As mentioned, it'll require removal of the existing RAM & a socket to be installed.
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http://www.pinitech.com - "Pinball Inspired Technology"
NVRAM, kits, upgrades and test equipment for pinball machines