stella/src/emucore/Cart4K.hxx

//============================================================================
//
//   SSSS    tt          lll  lll       
//  SS  SS   tt           ll   ll        
//  SS     tttttt  eeee   ll   ll   aaaa 
//   SSSS    tt   ee  ee  ll   ll      aa
//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
//  SS  SS   tt   ee      ll   ll  aa  aa
//   SSSS     ttt  eeeee llll llll  aaaaa
//
// Copyright (c) 1995-2010 by Bradford W. Mott and the Stella team
//
// See the file "license" for information on usage and redistribution of
// this file, and for a DISCLAIMER OF ALL WARRANTIES.
//
// $Id$
//============================================================================

#ifndef CARTRIDGE4K_HXX
#define CARTRIDGE4K_HXX

class System;

#include "bspf.hxx"
#include "Cart.hxx"

/**
  This is the standard Atari 4K cartridge.  These cartridges are 
  not bankswitched.

  @author  Bradford W. Mott
  @version $Id$
*/
class Cartridge4K : public Cartridge
{
  public:
    /**
      Create a new cartridge using the specified image

      @param image Pointer to the ROM image
    */
    Cartridge4K(const uInt8* image);
 
    /**
      Destructor
    */
    virtual ~Cartridge4K();

  public:
    /**
      Reset cartridge to its power-on state
    */
    virtual void reset();

    /**
      Install cartridge in the specified system.  Invoked by the system
      when the cartridge is attached to it.

      @param system The system the device should install itself in
    */
    virtual void install(System& system);

    /**
      Install pages for the specified bank in the system.

      @param bank The bank that should be installed in the system
    */
    virtual void bank(uInt16 bank);

    /**
      Get the current bank.

      @return  The current bank, or -1 if bankswitching not supported
    */
    virtual int bank();

    /**
      Query the number of banks supported by the cartridge.
    */
    virtual int bankCount();

    /**
      Patch the cartridge ROM.

      @param address  The ROM address to patch
      @param value    The value to place into the address
      @return    Success or failure of the patch operation
    */
    virtual bool patch(uInt16 address, uInt8 value);

    /**
      Access the internal ROM image for this cartridge.

      @param size  Set to the size of the internal ROM image data
      @return  A pointer to the internal ROM image data
    */
    virtual uInt8* getImage(int& size);

    /**
      Save the current state of this cart to the given Serializer.

      @param out  The Serializer object to use
      @return  False on any errors, else true
    */
    virtual bool save(Serializer& out) const;

    /**
      Load the current state of this cart from the given Serializer.

      @param in  The Serializer object to use
      @return  False on any errors, else true
    */
    virtual bool load(Serializer& in);

    /**
      Get a descriptor for the device name (used in error checking).

      @return The name of the object
    */
    virtual string name() const { return "Cartridge4K"; }

  public:
    /**
      Get the byte at the specified address.

      @return The byte at the specified address
    */
    virtual uInt8 peek(uInt16 address);

    /**
      Change the byte at the specified address to the given value

      @param address The address where the value should be stored
      @param value The value to be stored at the address
    */
    virtual void poke(uInt16 address, uInt8 value);

  private:
    // The 4K ROM image for the cartridge
    uInt8 myImage[4096];
};

#endif