Part Number : G65SC51P-1
Function : CMOS Asynchronous Interface Adapter
Package : DIP 28 Pin type, PLCC 28 Type
Maker : California Micro Devices , Onsemi
Image : 
Description :
The CMD G65SC51P-1 is Asynchronous Communications Interface Adapter which offers many versatitle features for interfacing 6500 / 6800 microprocessors to serial communication data sets and modems.
Features :
1. 15 Programmable baud rates.
2. Programmable interrupt and status registers
3. False start bit detection
Reference PDF :
http://archive.6502.org/datasheets/cmd_g65sc51_acia_mar2000.pdf
Datasheet PDF Download : 
Others datasheet of same file :
G65SC51C-1, G65SC51C-2, G65SC51C-3, G65SC51C-4, G65SC51CI-2