This part is a kind of semiconductor called W27C512.

Function of this product has 64K X 8 ELECTRICALLY ERASABLE EPROM.

Manufacturers : Winbond

Image and pinout :

Some of the text within the PDF file :

W27C512 64K × 8 ELECTRICALLY ERASABLE EPROM GENERAL DESCRIPTION The W27C512 is a high speed, low power Electrically Erasable and Programmable Read Only Memory organized as 65536 × 8 bits that operates on a single 5 volt power supply. The W27C512 provides an electrical chip erase function. FEATURES • High speed access time: 45/70/90/120 nS (max.) • Read operating current: 30 mA (max.) • Erase/Programming operating current 30 mA (max.) • Standby current: 1 mA (max.) • Single 5V power supply • +14V erase/+12V programming voltage • Fully static operation • All inputs and outputs directly TTL/CMOS compatible • Three-state outputs • Available packages: 28-pin 600 mil DIP, 330 mil 32-pin PLCC PIN CONFIGURATIONS BLOCK DIAGRAM A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 GN [ ... ]

W27C512 PDF Datasheet Download