ARG
===

Function
--------

**ARG** Is used for passing parameters to machine code subroutines.

Syntax
------

D=ARG(N)

| Where D is a Dummy Variable
| N is the number to be passed

Examples
--------

::

   P=ARG(10)

Passes 10

::

   P=ARG(V)

Passes V

Remarks
-------

ARG loads the Z80 E and C registers. They are loaded with the higher and
lower byte portions of a 16 bit representation of the ARG argument.

For example if V in the example above was 4100 then;

E=16 C=4

.. Note::

   16x256+4 = 4100

This function is useful when making CP/M system calls to set the C
register before a call to location 5. See
:doc:`../basic-programming/machine-code-calls`.