Describe 3 hardware independent assembler featuresSolutionTh

Describe 3 hardware independent assembler features.

Solution

The hardware independent assembler features are:

1. Symbol defining statements:

2. Expressions: Expressions can be classified into two types, absolute expressions or relative expressions.

MAXLEN EQU BUFEND-BUFFER. The BUFEND and BUFFER both are relative terms indicating addresses within the program. he expression BUFEND-BUFFER represents an absolute value. When relative terms are matched with reverse signs, the dependency on the starting address of the program is canceled and the result is an absolute value. Multiplication or division operations results in errors if used in relative expressions.

3. Control Sections and Program Linking: The control sections are used for subroutines or other logical sub-divisions of a program. The programmer can gather, load and control each of the control sections individually. The instruction in one control section refer to the instructions or the data in another section. So that the control sections must linked together by some means.