mirror of https://github.com/stella-emu/stella.git
147 lines
3.7 KiB
C++
147 lines
3.7 KiB
C++
//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2010 by Bradford W. Mott and the Stella Team
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//
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// See the file "License.txt" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id$
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//============================================================================
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#include <cassert>
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#include <cstring>
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#include "System.hxx"
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#include "Cart4K.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Cartridge4K::Cartridge4K(const uInt8* image)
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{
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// Copy the ROM image into my buffer
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memcpy(myImage, image, 4096);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Cartridge4K::~Cartridge4K()
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{
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Cartridge4K::reset()
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{
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myBankChanged = true;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Cartridge4K::install(System& system)
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{
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mySystem = &system;
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uInt16 shift = mySystem->pageShift();
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uInt16 mask = mySystem->pageMask();
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// Make sure the system we're being installed in has a page size that'll work
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assert((0x1000 & mask) == 0);
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System::PageAccess access;
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access.directPokeBase = 0;
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access.device = this;
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// Map ROM image into the system
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for(uInt32 address = 0x1000; address < 0x2000; address += (1 << shift))
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{
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access.directPeekBase = &myImage[address & 0x0FFF];
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mySystem->setPageAccess(address >> mySystem->pageShift(), access);
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt8 Cartridge4K::peek(uInt16 address)
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{
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return myImage[address & 0x0FFF];
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Cartridge4K::poke(uInt16, uInt8)
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{
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// This is ROM so poking has no effect :-)
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return false;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Cartridge4K::bank(uInt16)
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{
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// Doesn't support bankswitching
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt16 Cartridge4K::bank() const
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{
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// Doesn't support bankswitching
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return 0;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt16 Cartridge4K::bankCount() const
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{
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return 1;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Cartridge4K::patch(uInt16 address, uInt8 value)
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{
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myImage[address & 0x0FFF] = value;
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return myBankChanged = true;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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const uInt8* Cartridge4K::getImage(int& size) const
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{
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size = 4096;
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return myImage;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Cartridge4K::save(Serializer& out) const
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{
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const string& cart = name();
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try
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{
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out.putString(cart);
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}
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catch(const char* msg)
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{
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cerr << "ERROR: Cartridge4K::save" << endl << " " << msg << endl;
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return false;
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}
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return true;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Cartridge4K::load(Serializer& in)
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{
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const string& cart = name();
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try
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{
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if(in.getString() != cart)
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return false;
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}
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catch(const char* msg)
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{
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cerr << "ERROR: Cartridge4K::load" << endl << " " << msg << endl;
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return false;
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}
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return true;
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}
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