mirror of https://github.com/stella-emu/stella.git
138 lines
4.2 KiB
C++
138 lines
4.2 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) 1995-2020 by Bradford W. Mott, Stephen Anthony
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// 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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#include "System.hxx"
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#include "CartMDM.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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CartridgeMDM::CartridgeMDM(const ByteBuffer& image, size_t size,
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const string& md5, const Settings& settings,
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size_t bsSize)
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: CartridgeEnhanced(image, size, md5, settings,
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bsSize == 0 ? BSPF::nextPowerOfTwo(size) : bsSize)
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{
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void CartridgeMDM::install(System& system)
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{
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CartridgeEnhanced::install(system);
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// Get the page accessing methods for the hot spots since they overlap
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// areas within the TIA we'll need to forward requests to the TIA
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myHotSpotPageAccess[0] = mySystem->getPageAccess(0x0800);
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myHotSpotPageAccess[1] = mySystem->getPageAccess(0x0900);
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myHotSpotPageAccess[2] = mySystem->getPageAccess(0x0A00);
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myHotSpotPageAccess[3] = mySystem->getPageAccess(0x0B00);
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myHotSpotPageAccess[4] = mySystem->getPageAccess(0x0C00);
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myHotSpotPageAccess[5] = mySystem->getPageAccess(0x0D00);
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myHotSpotPageAccess[6] = mySystem->getPageAccess(0x0E00);
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myHotSpotPageAccess[7] = mySystem->getPageAccess(0x0F00);
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// Set the page accessing methods for the hot spots
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System::PageAccess access(this, System::PageAccessType::READWRITE);
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for(uInt16 addr = 0x0800; addr < 0x0BFF; addr += System::PAGE_SIZE)
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mySystem->setPageAccess(addr, access);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeMDM::checkSwitchBank(uInt16 address, uInt8)
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{
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// Switch banks if necessary
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if((address & 0x1C00) == 0x0800)
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{
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bank(address & 0x0FF);
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return true;
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}
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return false;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt8 CartridgeMDM::peek(uInt16 address)
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{
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// Because of the way we've set up accessing above, we can only
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// get here when the addresses are from 0x800 - 0xBFF
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checkSwitchBank(address);
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int hotspot = ((address & 0x0F00) >> 8) - 8;
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return myHotSpotPageAccess[hotspot].device->peek(address);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeMDM::poke(uInt16 address, uInt8 value)
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{
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// All possible addresses can appear here, but we only care
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// about those below $1000
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if(!(address & 0x1000))
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{
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checkSwitchBank(address);
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int hotspot = ((address & 0x0F00) >> 8) - 8;
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myHotSpotPageAccess[hotspot].device->poke(address, value);
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}
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return false;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeMDM::bank(uInt16 bank, uInt16)
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{
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if(bankLocked() || myBankingDisabled) return false;
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CartridgeEnhanced::bank(bank);
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// Accesses above bank 127 disable further bankswitching; we're only
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// concerned with the lower byte
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myBankingDisabled = myBankingDisabled || bank > 127;
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return myBankChanged = true;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeMDM::save(Serializer& out) const
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{
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CartridgeEnhanced::save(out);
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try
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{
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out.putBool(myBankingDisabled);
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}
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catch(...)
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{
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cerr << "ERROR: CartridgeMDM::save" << 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 CartridgeMDM::load(Serializer& in)
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{
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CartridgeEnhanced::load(in);
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try
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{
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myBankingDisabled = in.getBool();
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}
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catch(...)
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{
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cerr << "ERROR: CartridgeMDM::load" << 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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