MSXKanji12.cc

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#include "MSXKanji12.hh"
#include "MSXException.hh"
#include "one_of.hh"
#include "serialize.hh"
 
namespace openmsx {
 
constexpr byte ID = 0xF7;
 
MSXKanji12::MSXKanji12(const DeviceConfig& config)
        : MSXDevice(config)
        , MSXSwitchedDevice(getMotherBoard(), ID)
        , rom(getName(), "Kanji-12 ROM", config)
{
        if (rom.getSize() != one_of(0x20000u, 0x40000u)) {
                throw MSXException("MSXKanji12: wrong kanji ROM, it should be either 128kB or 256kB.");
        }
 
        reset(EmuTime::dummy());
}
 
void MSXKanji12::reset(EmuTime::param /*time*/)
{
        address = 0; // TODO check this
}
 
byte MSXKanji12::readSwitchedIO(word port, EmuTime::param time)
{
        byte result = peekSwitchedIO(port, time);
        switch (port & 0x0F) {
                case 9:
                        address++;
                        break;
        }
        return result;
}
 
byte MSXKanji12::peekSwitchedIO(word port, EmuTime::param /*time*/) const
{
        byte result;
        switch (port & 0x0F) {
                case 0:
                        result = byte(~ID);
                        break;
                case 1:
                        result = 0x08; // TODO what is this
                        break;
                case 9:
                        if (address < rom.getSize()) {
                                result = rom[address];
                        } else {
                                result = 0xFF;
                        }
                        break;
                default:
                        result = 0xFF;
                        break;
        }
        return result;
}
 
void MSXKanji12::writeSwitchedIO(word port, byte value, EmuTime::param /*time*/)
{
        switch (port & 0x0F) {
                case 2:
                        // TODO what is this?
                        break;
                case 7: {
                        byte row = value;
                        byte col = ((address - 0x800) / 18) % 192;
                        address = 0x800 + (row * 192 + col) * 18;
                        break;
                }
                case 8: {
                        byte row = (address - 0x800) / (18 * 192);
                        byte col = value;
                        address = 0x800 + (row * 192 + col) * 18;
                        break;
                }
        }
}
 
template<typename Archive>
void MSXKanji12::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<MSXDevice>(*this);
        // no need to serialize MSXSwitchedDevice base class
 
        ar.serialize("address", address);
}
INSTANTIATE_SERIALIZE_METHODS(MSXKanji12);
REGISTER_MSXDEVICE(MSXKanji12, "Kanji12");
 
} // namespace openmsx