This part is a kind of semiconductor called 27C010.

Function of this product has 1 /048 /576-Bit (128K x 8) High Performance CMOS EPROM.

Manufacturers : Fairchild

Image and pinout :

Some of the text within the PDF file :

NM27C010 1,048,576-Bit (128K x 8) High Performance CMOS EPROM October 1998 NM27C010 1,048,576-Bit (128K x 8) High Performance CMOS EPROM General Description The NM27C010 is a high performance, 1,048,576-bit Electrically Programmable UV Erasable Read Only Memory. It is organized as 128K-words of 8 bits each. Its pin-compatibility with byte-wide JEDEC EPROMs enables upgrades through 8 Mbit EPROMs. The “Don’t Care” feature during read operations allows memory expansions from 1M to 8M bits with no printed circuit board changes. The NM27C010 can directly replace lower density 28-pin EPROMs by adding an A16 address line and VCC jumper. During the normal read operation PGM and VPP are in a “Don’t Care” state which allows higher order addresses, such as A17, A18, and A19 to be connec [ ... ]

27C010 PDF Datasheet Download