This part is a kind of semiconductor called AM27C040-150DC.

Function of this product has 4 Megabit (512 K x 8-Bit) CMOS EPROM.

Manufacturers : Advanced Micro Devices

Image and pinout :

Some of the text within the PDF file :

FINAL Am27C040 4 Megabit (512 K x 8-Bit) CMOS EPROM DISTINCTIVE CHARACTERISTICS s Fast access time Available in speed options as fast as 90 ns s Low power consumption <10 µA typical CMOS standby current s JEDEC-approved pinout Plug-in upgrade for 1 Mbit and 2 Mbit EPROMs Easy upgrade from 28-pin JEDEC EPROMs s Single +5 V power supply s ±10% power supply tolerance standard s 100% Flashrite™ programming Typical programming time of 1 minute s Latch-up protected to 100 mA from –1 V to VCC + 1 V s High noise immunity s Compact 32-pin DIP, PDIP, PLCC packages GENERAL DESCRIPTION The Am27C040 is a 4 Mbit ultraviolet erasable programmable read-only memory. It is organized as 512K bytes, operates from a single +5 V supply, has a static standby mode, and features fast si [ ... ]

AM27C040-150DC PDF Datasheet Download