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## 4. Platform specific header files

Programs containing Supervision specific code may use the `supervision.h` header file.

## 4.1 Supervision specific functions

- waitvblank

## 4.2 Hardware access

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

`IO`

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

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