RomArc.cc

Go to the documentation of this file.

// Parallax' Arc
 
#include "RomArc.hh"
#include "MSXCPUInterface.hh"
#include "serialize.hh"
 
namespace openmsx {
 
RomArc::RomArc(const DeviceConfig& config, Rom&& rom_)
        : Rom16kBBlocks(config, std::move(rom_))
{
        setUnmapped(0);
        setRom(1, 0);
        setRom(2, 1);
        setUnmapped(3);
 
        reset(EmuTime::dummy());
 
        getCPUInterface().register_IO_InOut(0x7f, this);
}
 
RomArc::~RomArc()
{
        getCPUInterface().unregister_IO_InOut(0x7f, this);
}
 
void RomArc::reset(EmuTime::param /*time*/)
{
        offset = 0x00;
}
 
void RomArc::writeIO(word /*port*/, byte value, EmuTime::param /*time*/)
{
        if (value == 0x35) {
                ++offset;
        }
}
 
byte RomArc::readIO(word port, EmuTime::param time)
{
        return RomArc::peekIO(port, time);
}
 
byte RomArc::peekIO(word /*port*/, EmuTime::param /*time*/) const
{
        return ((offset & 0x03) == 0x03) ? 0xda : 0xff;
}
 
template<typename Archive>
void RomArc::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<Rom16kBBlocks>(*this);
        ar.serialize("offset", offset);
}
INSTANTIATE_SERIALIZE_METHODS(RomArc);
REGISTER_MSXDEVICE(RomArc, "RomArc");
 
} // namespace openmsx