This part is a kind of semiconductor called 27C64.

Function of this product has 64 Kbit 8Kb x 8 UV EPROM and OTP EPROM.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

M27C64A 64 Kbit (8Kb x 8) UV EPROM and OTP EPROM 5V ± 10% SUPPLY VOLTAGE in READ OPERATION FAST ACCESS TIME: 150ns LOW POWER “CMOS” CONSUMPTION: – Active Current 30mA – Standby Current 100µA PROGRAMMING VOLTAGE: 12.5V ± 0.25V HIGH SPEED PROGRAMMING (less than 1 minute) ELECTRONIC SIGNATURE – Manufacturer Code: 9Bh – Device Code: 08h DESCRIPTION The M27C64A is a 64Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems requiring large programs and is organized as 8,192 by 8 bits. The FDIP28W (window ceramic frit-seal package) has transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written to the device by following [ ... ]

27C64 PDF Datasheet Download