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had the same issue and it was the ribbon cables causing it.

was gonna suggest mame but after checking I see no bootleg. could you post a picture of the board. also i'm sure mamedev wouldn't mind a dump of the roms.

ah man. was hoping for a real mystery

or maybe targ both were made in 1980 and look like they use the same pcb

you can try ebay just search for 27256 eprom

I have one and it's identical to that one

these work great for the bnc connections bought A pack of 10 on ebay for like $5 a few years ago

#19 Mystery Konami bootleg that's Hyper Olympic A Track & Field bootleg

took me 2 years to post unfortunately it's not much help

my title screen is the same but the garage door is completely missing and the characters are mostly arms and legs I have a working boardset also so I swapped them around and found the fault is on the bottom board and that's as far as I got I did check the roms and they were all good