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◆ main openmsx / src / MSXKanji12.cc
1.9 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#include "MSXKanji12.hh"
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#include "MSXException.hh"
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#include "TclObject.hh"
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#include "serialize.hh"
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#include "narrow.hh"
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#include "one_of.hh"
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namespace openmsx {
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static constexpr byte ID = 0xF7;
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MSXKanji12::MSXKanji12(DeviceConfig& config)
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	: MSXDevice(config)
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	, MSXSwitchedDevice(getMotherBoard(), ID)
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	, rom(getName(), "Kanji-12 ROM", config)
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{
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	if (rom.size() != one_of(0x20000u, 0x40000u)) {
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		throw MSXException("MSXKanji12: wrong kanji ROM, it should be either 128kB or 256kB.");
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	}
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	reset(EmuTime::dummy());
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}
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void MSXKanji12::reset(EmuTime /*time*/)
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{
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	address = 0; // TODO check this
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}
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byte MSXKanji12::readSwitchedIO(uint16_t port, EmuTime time)
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{
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	byte result = peekSwitchedIO(port, time);
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	switch (port & 0x0F) {
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		case 9:
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			address++;
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			break;
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	}
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	return result;
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}
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byte MSXKanji12::peekSwitchedIO(uint16_t port, EmuTime /*time*/) const
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{
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	switch (port & 0x0F) {
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		case 0:
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			return byte(~ID);
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		case 1:
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			return 0x08; // TODO what is this
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		case 9:
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			if (address < rom.size()) {
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				return rom[address];
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			} else {
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				return 0xFF;
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			}
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		default:
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			return 0xFF;
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	}
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}
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void MSXKanji12::writeSwitchedIO(uint16_t port, byte value, EmuTime /*time*/)
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{
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	switch (port & 0x0F) {
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		case 2:
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			// TODO what is this?
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			break;
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		case 7: {
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			byte row = value;
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			byte col = narrow<byte>(((address - 0x800) / 18) % 192);
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			address = 0x800 + (row * 192 + col) * 18;
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			break;
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		}
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		case 8: {
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			byte row = narrow<byte>((address - 0x800) / (18 * 192));
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			byte col = value;
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			address = 0x800 + (row * 192 + col) * 18;
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			break;
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		}
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	}
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}
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void MSXKanji12::getExtraDeviceInfo(TclObject& result) const
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{
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	rom.getInfo(result);
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}
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template<typename Archive>
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void MSXKanji12::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<MSXDevice>(*this);
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	// no need to serialize MSXSwitchedDevice base class
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	ar.serialize("address", address);
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}
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INSTANTIATE_SERIALIZE_METHODS(MSXKanji12);
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REGISTER_MSXDEVICE(MSXKanji12, "Kanji12");
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} // namespace openmsx