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## 4. Platform specific header files

Programs containing NES specific code may use the `nes.h` header file.

## 4.1 NES specific functions

- waitvblank
- get_tv

## 4.2 Hardware access

The following pseudo variables declared in the `nes.inc` include file do allow access to hardware located in the address space.

`PPU`

  The `PPU` defines allow access to the PPU chip.

`APU`

  The `APU` defines allow access to the APU chip.

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