NM27C040Q-120 Eprom Fairchild and various manufacturers NEW/NOS Eproms. 4,194,304-words x 8-bit High Performance CMOS Eprom that is UV Erasable and programmable read only memory 512Kx8 (512K) 32 pin Dip-32 package. These are used in many older 80’s, 90’s and newer game boards and contact us if you need programming. Most are 120ns and faster. These 27C040 eproms can replace the 27C4001 eproms.