File: Cart2K.cxx

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//============================================================================
//
//    SSSS    tt          lll  lll              
//   SS  SS   tt           ll   ll                
//   SS     tttttt  eeee   ll   ll   aaaa    "An Atari 2600 VCS Emulator"
//    SSSS    tt   ee  ee  ll   ll      aa      
//       SS   tt   eeeeee  ll   ll   aaaaa   Copyright (c) 1995,1996,1997
//   SS  SS   tt   ee      ll   ll  aa  aa         Bradford W. Mott
//    SSSS     ttt  eeeee llll llll  aaaaa    
//
//============================================================================

/**
  Object of this class are used to represent 2K cartridges.

  @author  Bradford W. Mott
  @version $Id: Cart2K.cxx,v 1.2 1997/05/17 19:00:02 bwmott Exp $
*/

#include "Cart2K.hxx"
#include "System.hxx"

//============================================================================
// Constructor
//============================================================================
Cartridge2K::Cartridge2K(System& system, uByte* image)
    : Cartridge(system),
      myImageOffset(0)
{
  // Copy the ROM image into my buffer
  for(uWord addr = 0; addr < 2048; ++addr)
    myImage[addr] = image[addr];

  // Map all of my addresses in the system
  for(uWord address = 0; address < 8192; ++address)
  {
    if(address & 0x1000)
    {
      mySystem.mapPeek(address, *this, 
          &myImage[address & 0x07ff], &myImageOffset);
      mySystem.mapPoke(address, *this);
    }
  }
}

//============================================================================ 
// Destructor
//============================================================================ 
Cartridge2K::~Cartridge2K()
{
}

//============================================================================ 
// Answer the byte at the given address
//============================================================================ 
uByte Cartridge2K::peek(uWord addr)
{
  return myImage[addr & 0x07ff];
}

//============================================================================ 
// Reset to my power on state
//============================================================================ 
void Cartridge2K::reset()
{
  myImageOffset = 0;
}