Critically analyze the two modes of asynchronous data transfer techniques accompanied by suitable diagrams when the speed of I/O devices do not match with microprocessor and the timing characteristics...

Critically analyze the two modes of asynchronous data transfer techniques accompanied by suitable diagrams when the speed of I/O devices do not match with microprocessor and the timing characteristics of the I/O device is not predictable. In addition, discuss the limitation of each data transfer approach.