1. Princess Sumaya Univ. Computer Engineering Dept. Chapter 3:

2. Princess Sumaya University 22342 – Computer Org. & Assembly Lang. Computer Engineering Dept. 1 / 5 Code & Data .Data Directive ●Definitions of Variables ●Memory Reservation .Code Directive ●Instructions  END Directive ●Last Line Program File.Data.Code END

3. Princess Sumaya University 22342 – Computer Org. & Assembly Lang. Computer Engineering Dept. 2 / 5 Code & Data Directives  Variables ●Byte, Word ●Initial Value ●Arrays Program File.Data.CodeMemory 0000 0001 0002 0003 0004 0005 END DS

4. Princess Sumaya University 22342 – Computer Org. & Assembly Lang. Computer Engineering Dept. 3 / 5 Memory Segments Program File.Data.Code END Byte 1 M 64 K CS DS

5. Princess Sumaya University 22342 – Computer Org. & Assembly Lang. Computer Engineering Dept. 4 / 5 Data Directives  Constants ●Binary ●Decimal ●Hexadecimal ●ASCII Program File.Data.Code END

6. Princess Sumaya University 22342 – Computer Org. & Assembly Lang. Computer Engineering Dept. 5 / 5 Expressions  Operator Precedence ●( ) ●+ n, –m ●*, / ●MOD ●+, – Example: Program File.Data.Code END

7. Princess Sumaya University 22342 – Computer Org. & Assembly Lang. Computer Engineering Dept. Chapter 3