MSXBunsetsu.cc

Go to the documentation of this file.

#include "MSXBunsetsu.hh"
#include "CacheLine.hh"
#include "serialize.hh"
 
namespace openmsx {
 
MSXBunsetsu::MSXBunsetsu(const DeviceConfig& config)
        : MSXDevice(config)
        , bunsetsuRom(getName() + "_1", "rom", config, "bunsetsu")
        , jisyoRom   (getName() + "_2", "rom", config, "jisyo")
{
        reset(EmuTime::dummy());
}
 
void MSXBunsetsu::reset(EmuTime::param /*time*/)
{
        jisyoAddress = 0;
}
 
byte MSXBunsetsu::readMem(word address, EmuTime::param /*time*/)
{
        if (address == 0xBFFF) {
                byte result = jisyoRom[jisyoAddress];
                jisyoAddress = (jisyoAddress + 1) & 0x1FFFF;
                return result;
        } else if ((0x4000 <= address) && (address < 0xC000)) {
                return bunsetsuRom[address - 0x4000];
        } else {
                return 0xFF;
        }
}
 
void MSXBunsetsu::writeMem(word address, byte value, EmuTime::param /*time*/)
{
        switch (address) {
        case 0xBFFC:
                jisyoAddress = (jisyoAddress & 0x1FF00) | value;
                break;
        case 0xBFFD:
                jisyoAddress = (jisyoAddress & 0x100FF) | (value << 8);
                break;
        case 0xBFFE:
                jisyoAddress = (jisyoAddress & 0x0FFFF) |
                               ((value & 1) << 16);
                break;
        }
}
 
const byte* MSXBunsetsu::getReadCacheLine(word start) const
{
        if ((start & CacheLine::HIGH) == (0xBFFF & CacheLine::HIGH)) {
                return nullptr;
        } else {
                return &bunsetsuRom[start - 0x4000];
        }
}
 
byte* MSXBunsetsu::getWriteCacheLine(word start)
{
        if ((start & CacheLine::HIGH) == (0xBFFF & CacheLine::HIGH)) {
                return nullptr;
        } else {
                return unmappedWrite.data();
        }
}
 
template<typename Archive>
void MSXBunsetsu::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<MSXDevice>(*this);
        ar.serialize("jisyoAddress", jisyoAddress);
}
INSTANTIATE_SERIALIZE_METHODS(MSXBunsetsu);
REGISTER_MSXDEVICE(MSXBunsetsu, "Bunsetsu");
 
} // namespace openmsx