Assembler program = a computer cprogram written in an assembler programming language

Assembler programming language = a "language" that consist of mnemonic codes that represent all the computer instructions

Explanation:

Recall that computer instructions are represented by binary numbers See:

Assembler = a computer program that translates mnemonic codes into computer instructions (stored in binary representation !!)

Example:

To remember the names of the 5 great lakes, you can use the mnemonic HOMES: H = Huron O = Ontario M = Michigan E = Erie S = Superior

Example assembler instructions:

add.b D0, D1 mnemonic for: add the byte operands in D0 and D1 and store result in D1

[label1] line1 [comment1] [label2] line2 [comment2] [label3] line3 [comment3] .... and so on end

The bracket [ ... ] denotes an optional field

one assembler directive,         or one assembler instruction (= mnemonic for a computer instruction)

Assembler directive = a command given to the assembler program An assembler directive tells (= directs) the assembler to do something

Tell assembler to start a program at a certain location in memory Tell assembler to define a symbolic constant Tell assembler to reserve space in memory (RAM) for program variables Tell assembler to stop assembling

Assembler instruction = a "easy to remember" (mnemonic) code to represent a computer instruction

Further explanation:

To program a computer, you would actually have to write binary codes that represent computer operations For example, you would need to write this: 11001100 <--- computer instructions are encoded 01001000 using binary numbers !!! 10101100 10010101 .... To simplify the process of writing assembler programs, you will write assembler instructions For example: add d0, d1 <--- assembler instruction move x, d0 .... You use a translation program (called the assembler) to translate the assembler program into (binary) machine codes !!!