Chapter 1

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Information Technology Management
ITM 200
Vikraman Baskaran

Chapter 1 Solving problems with computers 1.1Computers and programming What is a computer? A computer is a general-purpose device that behaves according to the sets of instructions and data it is provided with o It executes instructions to process data o Each computer has a CPU What is a computer program? A machine code computer program consists of a sequence of these instructions which might look like this o 1001010010010010 o The instructions are sequences of 1s and 0s (binary bit patterns) o This program can be stored on a disk o To perform this program, it is loaded from the disk into the computers internal memory then the instructions are obtained 1 by 1 by the CPU and executed Before, programmer would write all the programs in the machine code of the processor, it has few bad effects (on pg 2) Assembler language Assembler language was invented to overcome the problem of writing programs using binary bit patterns Data can be seen as decimal numbers instead of binary o For example, an instruction to load the number 5 into a CPU register might look like LD 5 o Instead of 0010010001001101
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