MSXSCCPlusCart.hh

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// Note: this device is actually called SCC-I. But this would take a lot of
// renaming, which isn't worth it right now. TODO rename this :)
 
#ifndef MSXSCCPLUSCART_HH
#define MSXSCCPLUSCART_HH
 
#include "MSXDevice.hh"
#include "SCC.hh"
#include "Ram.hh"
#include "RomBlockDebuggable.hh"
#include <array>
 
namespace openmsx {
 
class MSXSCCPlusCart final : public MSXDevice
{
public:
        struct MapperConfig {
                unsigned numBlocks;  // number of 8kB blocks
                byte registerMask;   // mapper selection bits to ignore
                byte registerOffset; // first mapped block
        };
 
public:
        explicit MSXSCCPlusCart(const DeviceConfig& config);
 
        void powerUp(EmuTime::param time) override;
        void reset(EmuTime::param time) override;
        [[nodiscard]] byte readMem(word address, EmuTime::param time) override;
        [[nodiscard]] byte peekMem(word address, EmuTime::param time) const override;
        void writeMem(word address, byte value, EmuTime::param time) override;
        [[nodiscard]] const byte* getReadCacheLine(word start) const override;
        [[nodiscard]] byte* getWriteCacheLine(word start) override;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        void setMapper(int region, byte value);
        void setModeRegister(byte value);
        void checkEnable();
 
private:
        const MapperConfig mapperConfig;
        Ram ram;
        SCC scc;
        RomBlockDebuggable romBlockDebug;
        std::array<byte*, 4> internalMemoryBank; // 4 blocks of 8kB starting at #4000
        enum SCCEnable {EN_NONE, EN_SCC, EN_SCCPLUS} enable;
        byte modeRegister;
        std::array<bool, 4> isRamSegment;
        std::array<bool, 4> isMapped;
        std::array<byte, 4> mapper;
};
 
} // namespace openmsx
 
#endif