I want to know these questions within today!!!!!!!!

Q1
A control unit is the part of a CPU or other device that directs its operation. The outputs of the unit control the activity of the rest of the device. A control unit can be thought of as a finite state machine.
At one time control units for CPUs were ad-hoc logic, and they were difficult to design. Now they are often implemented as a microprogram that is stored in a control store. Words of the microprogram are selected by a microsequencer and the bits from those words directly control the different parts of the device, including the registers, arithmetic and logic units, instruction registers, buses, and off-chip input/output. In modern computers, each of these subsystems may have its own subsidiary controller, with the control unit acting as a supervisor.

Q2
Laser printers, LED printer, Inkjet printer, Daisy wheel printer, Dot matrix printer, Dye-sublimation printer, Thermal printer.

Q3
ROM is built-in computer memory containing data that normally can only be read, not written to. ROM contains the programming that allows your computer to be booted up or regenerated each time you turn it on. Unlike a computer's random access memory (RAM), the data in ROM is not lost when the computer power is turned off. The ROM is sustained by a small long-life battery in your computer.

A.1 The control unit controls the actions of the CPU .

A.2 Types of printers are as Ink jet, bubble jet, laser jet, dot-matrix, daisy wheel &
thermal printers.

A.3 The main characteristics of ROM ,Read-Only Memory, that retains its data when
the power is turned off.