This part is a kind of semiconductor called Am27C256-200DC.

Function of this product has 256 Kilobit (32 K x 8-Bit) CMOS EPRO.

Manufacturers : Advanced Micro Devices

Image and pinout :

Some of the text within the PDF file :

FINAL Am27C256 256 Kilobit (32 K x 8-Bit) CMOS EPROM DISTINCTIVE CHARACTERISTICS s Fast access time Speed options as fast as 45 ns s Low power consumption 20 µA typical CMOS standby current s JEDEC-approved pinout s Single +5 V power supply s ±10% power supply tolerance standard s 100% Flashrite™ programming Typical programming time of 4 seconds s Latch-up protected to 100 mA from –1 V to VCC + 1 V s High noise immunity s Versatile features for simple interfacing Both CMOS and TTL input/output compatibility Two line control functions s Standard 28-pin DIP, PDIP, and 32-pin PLCC packages GENERAL DESCRIPTION The Am27C256 is a 256-Kbit, ultraviolet erasable programmable read-only memory. It is organized as 32K words by 8 bits per word, operates from a single +5 V s [ ... ]

Am27C256-200DC PDF Datasheet Download