100% WAEC ANSWERS ON COMPUTER BY 3PM APRIL 11th 2018.
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(2d)(i) Registers are temporary storage in the CPU that holds the data the processor is currently working on, while Main memory holds the program instructions and the data the program requires.
(ii) Main memory can be addressed on a byte boundaries, where Registers may not be able to access all the bytes in a register.
(iii) Registers are the fastest memory in a computer while Main memory is the slowest still-fast memory in a computer.
*1A* A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically. Modern computers have the ability to follow generalized sets of operations, called programs.
Electronic Delay storage Automatic Calculator
Electronic discrete Variable Automatic computer
2a)What is Register?
Register is one of a small set of data holding places that are part of a computer processor. it hold computer instruction , a storage address , or any kind of data (such as a bit sequence or individual character).
2b)TWO TYPES OF REGISTER
1)memory address register(Mar)
4)Memory data Register(MDR)
3 functions of Register
i)Register are used to quickly accept , store and transfer data and instructions that are being used immediately by the CPU
ii)Register is used for storing the results that are produced by the system
iii)MDR is the register of a computer's control unit that contains the data to be stored in the computer storage or the data after a fetch from the computer storage.
4a) A logic gate is an elementary building block of a digital circuit. Most logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary conditions low (0) or high (1), represented by different voltage levels.
-X NOR e.t.c
- Processor e.g intel
- Main memory e.g ROM
- Input devices e.g keyboard
- Output devices e.g speaker
No4ai) A logic gate is a computer circuit with several input but one output that can be activated by particular combinations of inputs.
4aii) x | y | output
0 | 0 | 0
0 | 1 | 1
1 | 0 | 1
1 | 1 | 0
4bi standard logic gate : i) OR
ii Alternative logic gate :
5ai) booting is the initialization of a computerized system.
5aii) Cold booting: when the computer is started after having been switched off. While Warm booting: when the operating system alone is restarted (without being switched off) after a system crash or 'freeze.'
5b) A peripheral is an auxiliary device used to put information into and get information out of the computer."
*Computer science objectives answers...*