This part is a kind of semiconductor called AT29C020-10.

Function of this product has 2-Megabit 256K x 8 5-volt Only CMOS Flash Memory.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

Features • • • • • • • • • • • • • Fast Read Access Time - 90 ns 5-Volt-Only Reprogramming Sector Program Operation Single Cycle Reprogram (Erase and Program) 1024 Sectors (256 bytes/sector) Internal Address and Data Latches for 256-Bytes Internal Program Control and Timer Hardware and Software Data Protection Two 8 KB Boot Blocks with Lockout Fast Sector Program Cycle Time - 10 ms DATA Polling for End of Program Detection Low Power Dissipation 40 mA Active Current 100 µA CMOS Standby Current Typical Endurance > 10,000 Cycles Single 5V ±10% Supply CMOS and TTL Compatible Inputs and Outputs Commercial and Industrial Temperature Ranges 2-Megabit (256K x 8) 5-volt Only CMOS Flash Memory AT29C020 Description The AT29C020 is a 5-volt-only in-system Flash programm [ ... ]

AT29C020-10 PDF Datasheet Download