mirror of https://github.com/stella-emu/stella.git
79 lines
2.1 KiB
C++
79 lines
2.1 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 "CartFC.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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CartridgeFC::CartridgeFC(const ByteBuffer& image, size_t size,
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const string& md5, const Settings& settings)
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: CartridgeEnhanced(image, size, md5, settings)
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{
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void CartridgeFC::reset()
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{
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CartridgeEnhanced::reset();
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myTargetBank = 0;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeFC::checkSwitchBank(uInt16 address, uInt8)
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{
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// Switch banks if necessary
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if(address == 0x0FFC)
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{
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// Trigger the bank switch
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bank(myTargetBank);
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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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bool CartridgeFC::poke(uInt16 address, uInt8 value)
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{
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address &= myBankMask;
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// Switch banks if necessary
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switch (address)
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{
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case 0x0FF8:
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// Set the two lowest bits of target 4k bank
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myTargetBank = value & 0b11;
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break;
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case 0x0FF9:
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// Set the high bits of target 4k bank
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if (value << 2 < bankCount())
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{
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myTargetBank += value << 2;
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myTargetBank %= bankCount();
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}
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else
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// special handling when both values are identical (e.g. 4/4 or 5/5)
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myTargetBank = value % bankCount();
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break;
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default:
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checkSwitchBank(address);
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}
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return false;
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}
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