27C4002 integrated circuit, dual inline package. 45ns access time. We use these on IGT slot machines model s-2000 on up. Main game program chip, "Stepper Base". Also used for reset/keychip utility chips.
We can program your eprom for a small fee. Just hit the Ask a Question Button on this item. We have many binary files going all the way back to the 1970's - arcades, jukeboxes, pinballs and slot machines. Or send us your binary file.