mirror of https://github.com/stella-emu/stella.git
91 lines
2.7 KiB
C++
91 lines
2.7 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) 1995-2020 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 "TIA.hxx"
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#include "Cart3E.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Cartridge3E::Cartridge3E(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::nextMultipleOf(size, 2_KB) : bsSize)
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{
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myBankShift = BANK_SHIFT;
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myRamSize = RAM_SIZE;
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myRamBankCount = RAM_BANKS;
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myRamWpHigh = RAM_HIGH_WP;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Cartridge3E::install(System& system)
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{
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CartridgeEnhanced::install(system);
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System::PageAccess access(this, System::PageAccessType::WRITE);
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// The hotspots ($3E and $3F) are in TIA address space, so we claim it here
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for(uInt16 addr = 0x00; addr < 0x40; 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 Cartridge3E::checkSwitchBank(uInt16 address, uInt8 value)
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{
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// Switch banks if necessary
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if(address == 0x003F) {
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// Switch ROM bank into segment 0
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bank(value);
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return true;
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}
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else if(address == 0x003E)
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{
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// Switch RAM bank into segment 0
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bank(value + romBankCount());
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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 Cartridge3E::peek(uInt16 address)
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{
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uInt16 peekAddress = address;
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address &= ROM_MASK;
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if(address < 0x0040) // TIA access
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return mySystem->tia().peek(address);
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return CartridgeEnhanced::peek(peekAddress);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Cartridge3E::poke(uInt16 address, uInt8 value)
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{
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uInt16 pokeAddress = address;
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address &= ROM_MASK;
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if(address < 0x0040) // TIA access
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{
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checkSwitchBank(address, value);
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return mySystem->tia().poke(address, value);
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}
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return CartridgeEnhanced::poke(pokeAddress, value);
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}
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