Lesson 04 – Introducing Assembly Language (Second Generation Language)

As we mentioned on previous lesson Machine language had so many limitations to overcome from that assembly language introduced in 1952. This language uses alphanumeric code and symbols instead binary digits to represent instruction and memory address.
 

Alphanumeric code uses set of letters and numbers represent an instruction.

Sample Program Snippet:

       1)      LD, AX, 9

       2)      LD,BX,10

       3)      ADD,AX,BX

       4)      LD(100),AX

       5)      JMP,BX

       6)      HTL

Code Line 1 - (Loads register AX with value 9)

Code Line 2 - (Load register BX with value 10)

Code Line 3 - (Adds value of register BX to the value of AX)

Code Line 4 – (Store the value of register AX in the main memory location, 100

Code Line 5 - (JUM to Jump to register BX to transfer the control to register BX)

Code Line 6- (Stop the program execute)
 

As we mentioned Lesson No 3 Computer only understand machine language (Binary Numbers).  As a result, Assembly language code must translate into Machine Language to execute the program this translation doing by an Assembler.

Introducing An Assembler

 

Function of an Assembler

The Assembler takes each statement in the source code (A code written in any program languages call as source code) and generate a corresponding bit stream or pattern (A series of 0s and 1s of given length) Its known as an Object code. Object code can execute whenever required.

Advantage of Assembly Language

• Easy to write and understand than machine language because of use alphanumeric code instead binary numbers.
• Easy to remember the Opcode and Alphanumeric code for address (Memory location).
•  Its save time consume cause easy to modify Assembly language program.

Disadvantage of Assembly Language.

Assembly language slower than machine language its take extra time to translate source code to object code.

Programs Created in Assembly language are depend on processors because Assembly language vocabulary varies from different processor. So program written in Assembly language for one processor might not work for another processor.

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