mirror of https://github.com/stella-emu/stella.git
85 lines
2.6 KiB
C++
85 lines
2.6 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 "Cart3EPlus.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Cartridge3EPlus::Cartridge3EPlus(const ByteBuffer& image, size_t size,
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const string& md5, const Settings& settings)
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: Cartridge3E(image, size, md5, settings)
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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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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Cartridge3EPlus::reset()
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{
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CartridgeEnhanced::reset();
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// 1st segment in mapped to start bank in CartridgeEnhanced
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bank(mySystem->randGenerator().next() % romBankCount(), 1);
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bank(mySystem->randGenerator().next() % romBankCount(), 2);
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bank(startBank(), 3);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Cartridge3EPlus::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 & 0b111111, value >> 6);
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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 & 0b111111) + romBankCount(), value >> 6);
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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 Cartridge3EPlus::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 peek
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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 Cartridge3EPlus::poke(uInt16 address, uInt8 value)
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{
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if(CartridgeEnhanced::poke(address, value))
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return true;
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if(address < 0x0040) // TIA poke
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// Handle TIA space that we claimed above
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return mySystem->tia().poke(address, value);
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return false;
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}
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