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## 4. Platform specific header files

Programs containing Atmos specific code may use the `atmos.h` header file.

## 4.1 Hardware access

The following pseudo variables declared in the `atmos.h` header file do allow access to hardware located in the address space. Some variables are structures, accessing the struct fields will access the chip registers.

`VIA`

  Access to the VIA (versatile interface adapter) chip is available via the `VIA` variable. The structure behind this variable is explained in `_6522.h`.

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