This part is a kind of semiconductor called AM85C30-10PC.

Function of this product has Enhanced Serial Communications Controller.

Manufacturers : Advanced Micro Devices

Image and pinout :

Some of the text within the PDF file :

FINAL Am85C30 Enhanced Serial Communications Controller DISTINCTIVE CHARACTERISTICS s Fastest data rate of any Am8530 8.192 MHz / 2.048 Mb/s 10 MHz / 2.5 Mb/s 16.384 MHz / 4.096 Mb/s s Low-power CMOS technology s Pin and function compatible with other NMOS and CMOS 8530s s Easily interfaced with most CPUs Compatible with non-multiplexed bus s Many enhancements over NMOS Am8530H Allows Am85C30 to be used more effectively in high-speed applications Improves interface capabilities s Two independent full-duplex serial channels s Asynchronous mode features Programmable stop bits, clock factor, character length and parity Break detection/generation Error detection for framing, overrun, and parity s Synchronous mode features Supports IBM® BISYNC, SDLC, SD [ ... ]

AM85C30-10PC PDF Datasheet Download