Welcome to RomId. With this online utility you can identify the ROMs on those random boards you have. Simply read in a ROM with your EPROM reader, and upload it. Or, if you have a CRC, you can enter it and look it up that way. There is a chance that 2 ROMs have the same CRC, but it is small. If in doubt, do 2 ROMs.
Whoever reported this not working, thank you! Fixed up a proxy problem and all good now.
Last Update: 2019.04.15 17:20:00 PST
Database Contains 75255 ROM CRCs in 5297 total ROM sets.
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Special thanks to tim at arcadecollecting.com for supplying the majority of the CRC database.