CS609 MIDTERM SPRING 2011

coprocessor Control word usage in testing of coprocessor

write the function of this code

(char hi, char lo)
hi= hi – 0x30;
lo = lo – 0x30;
hi= hi | lo;
return hi;

How we can access the battery powered RAM? Write steps?
Why we use buffering in UART FIFO queue?
In line control register what is the working of bit # 7?
What is serial communication? Explain it.
In flow control what is the working of D4?
How can we enable the 0x0f to perform interrupt driven I/O? Write a program.
In 13/3H service what is the value of AX and BX?