This part is a kind of semiconductor called 27C1024.

Function of this product has 1M-BIT [128K x 8/64K x 16] CMOS EPROM.

Manufacturers : Macronix International

Image and pinout :

Some of the text within the PDF file :

MX27C1100/27C1024 1M-BIT [128K x 8/64K x 16] CMOS EPROM FEATURES • 64K x 16 organization(MX27C1024, JEDEC pin • • • • • out) 128K x 8 or 64K x 16 organization(MX27C1100, ROM pin out compatible) +12.5V programming voltage Fast access time: 55/70/85/100/120/150 ns Totally static operation Completely TTL compatible • Operating current: 40mA • Standby current: 100uA • Package type: - 40 pin plastic DIP - 40 pin plastic SOP - 44 pin PLCC - 40pin 10 x 14mm TSOP(I) GENERAL DESCRIPTION The MX27C1024 is a 5V only, 1M-bit, One Time Programmable Read Only Memory. It is organized as 64K words by 16 bits per word(MX27C1024), 128K x 8 or 64K x 16(MX27C1100), operates from a single + 5 volt supply, has a static standby mode, and features fast single address location programming. All [ ... ]

27C1024 PDF Datasheet Download