I am working on porting work. I have program(DOS) which does I/O with 8251. We are NOT using any BIOS calls. 8251 is working in interrupt mode. I have to port this program to protected mode program, running in privilge level. I would be wondering if anybody could provide me some info on getting knowledge base about
1. 8251 pin out diagram and datasheet
2. How 8251 should be programmed in protected mode?