This part is a kind of semiconductor called 27C1024.

Function of this product has 1 Mbit 64Kb x16 UV EPROM and OTP EPROM.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

M27C1024 1 Mbit (64Kb x16) UV EPROM and OTP EPROM 5V ± 10% SUPPLY VOLTAGE in READ OPERATION FAST ACCESS TIME: 35ns LOW POWER CONSUMPTION: – Active Current 35mA at 5MHz – Standby Current 100µA PROGRAMMING VOLTAGE: 12.75V ± 0.25V PROGRAMMING TIME: 100µs/byte (typical) ELECTRONIC SIGNATURE – Manufacturer Code: 0020h – Device Code: 008Ch 40 40 1 1 FDIP40W (F) PDIP40 (B) DESCRIPTION The M27C1024 is a 1 Mbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems requiring large data or program storage and is organized as 65,536 words of 16 bits. The FDIP40W (window ceramic frit-seal package) has a transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit patte [ ... ]

27C1024 PDF Datasheet Download