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*2018 WAEC MAY/JUNE OBJ AMD THEORY*
COMPUTER OBJ ? ?
Computer system is a connection of electro-mechanical devices that link together forming a system inorder to perform automatic data processing (EDP)using software
Major Component of computer
i)Central processing unit(CPU)
Electronic Delay storage Automatic Calculator
Electronic discrete Variable Automatic computer
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).
TWO TYPES OF REGISTER
(1) – memory address register(Mar)
(2) – program counter
(3) – Accumulator Register(AC)
(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
(i) – Register are storage locations internal to the processor
While memory or Ram is located external to the CPU
ii)General memory can be addressed on byte boundaries while Registes may not be able to access all the bytes in a register
iii)Register are temporary storage in the CPU that hold the data processor is currently working on
While Main memory(RAM)hold the program instructions and the data the program requires
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
booting is the initialization of a computerized system.
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.’
A peripheral is an ancillary device used to put information into and get information out of the computer.”
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