# OS_DisableMainExArena

## C Specification

      #include <nitro/os.h>

      void OS_DisableMainExArena( void );

## Arguments

None.

## Return Values

None.

## Description

Declaration disabling use of expanded arena in main memory.

The main memory expanded arena can never be used when there is no expanded main memory. This applies to operations on the DS.

If you are going to call this function, do so before calling `OS_InitArena` or `OS_Init`.( `OS_InitArena` is called from `OS_Init`.))

To maintain compatibility with previous versions, there is also a way to specify `NITRO_MEMSIZE=4M` when compiling the OS library.

## See Also

`OS_InitArena, OS_EnableMainExArena
`

## Revision History

12/21/2004 Initial Version