Assembler 10

Syntax of a Macro

The parts which make a macro are:

Declaration of the macro
Code of the macro
Macro termination directive

The declaration of the macro is done the following way:

NameMacro MACRO [parameter1, parameter2...]

Even though we have the functionality of the parameters it is possible to create a macro which does not need them.

The directive for the termination of the macro is: ENDM

An example of a macro, to place the cursor on a determined position on the screen is:

Position MACRO Row, Column
PUSH AX
PUSH BX
PUSH DX
MOV AH, 02H
MOV DH, Row
MOV DL, Column
MOV BH, 0
INT 10H
POP DX
POP BX
POP AX
ENDM

To use a macro it is only necessary to call it by its name, as if it were another assembler instruction, since directives are no longer necessary as in the case of the procedures.