mirror of https://github.com/stella-emu/stella.git
97 lines
2.9 KiB
C++
97 lines
2.9 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) 1995-2024 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 "M6532.hxx"
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#include "TIA.hxx"
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#include "CartX07.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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CartridgeX07::CartridgeX07(const ByteBuffer& image, size_t size,
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string_view md5, const Settings& settings,
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size_t bsSize)
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: CartridgeEnhanced(image, size, md5, settings, bsSize)
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{
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void CartridgeX07::install(System& system)
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{
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CartridgeEnhanced::install(system);
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// Set the page accessing methods for the hot spots
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// The hotspots use almost all addresses below 0x1000, so we simply grab them
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// all and forward the TIA/RIOT calls from the peek and poke methods.
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const System::PageAccess access(this, System::PageAccessType::READWRITE);
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for(uInt16 addr = 0x00; addr < 0x1000; 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 CartridgeX07::checkSwitchBank(uInt16 address, uInt8)
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{
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// Switch banks if necessary
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if((address & 0x180f) == 0x080d)
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{
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bank((address & 0xf0) >> 4);
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return true;
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}
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else if((address & 0x1880) == 0)
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{
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if((getBank() & 0xe) == 0xe)
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{
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bank(((address & 0x40) >> 6) | 0xe);
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return true;
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}
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}
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return false;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt8 CartridgeX07::peek(uInt16 address)
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{
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uInt8 value = 0; // JTZ: is this correct?
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// Check for RAM or TIA mirroring
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const uInt16 lowAddress = address & 0x3ff;
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if(lowAddress & 0x80)
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value = mySystem->m6532().peek(address);
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else if(!(lowAddress & 0x200))
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value = mySystem->tia().peek(address);
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checkSwitchBank(address, 0);
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return value;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeX07::poke(uInt16 address, uInt8 value)
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{
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// Check for RAM or TIA mirroring
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const uInt16 lowAddress = address & 0x3ff;
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if(lowAddress & 0x80)
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mySystem->m6532().poke(address, value);
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else if(!(lowAddress & 0x200))
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mySystem->tia().poke(address, value);
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checkSwitchBank(address, 0);
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return false;
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}
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