Question: 1 - Is it possible to implement handshaking with only one bit? 2 - Why might a system use interrupt - driven I / O

1- Is it possible to implement handshaking with only one bit?
2- Why might a system use interrupt-driven I/O for a serial port and polling
for a front-end processor?
3- How does DMA increase system concurrency? How does it complicate
hardware design?
 1- Is it possible to implement handshaking with only one bit?

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