What type of control pins are needed in a microprocessor to regulate traffic on

What type of control pins are needed in a microprocessor to regulate traffic on the bus, in order to prevent two devices from trying to use it at the same time?

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1) Which of the following is not purely output device?

2) In most IBM PCs, the CPU, the device drives, memory expansion slots and active components are mounted on a single board. What is the name of this board?

3) The programs which are as permanent as hardware and stored in ROM is known as

4) Which of the following memories needs refreshing?

5) EPROM is generally erased by using