RomRetroHard31in1.cc

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// Retrohard 31-in-1 cartridge
//
//  31 in 1 cartridges use Port &H94 for mapping 32kB games at their respective
//  offsets into 0x4000-0xBFFF
 
#include "RomRetroHard31in1.hh"
#include "MSXCPUInterface.hh"
#include "serialize.hh"
#include "unreachable.hh"
 
namespace openmsx {
 
RomRetroHard31in1::RomRetroHard31in1(const DeviceConfig& config, Rom&& rom_)
        : Rom16kBBlocks(config, std::move(rom_))
{
        reset(EmuTime::dummy());
        getCPUInterface().register_IO_Out(0x94, this);
}
 
RomRetroHard31in1::~RomRetroHard31in1()
{
        getCPUInterface().unregister_IO_Out(0x94, this);
}
 
void RomRetroHard31in1::reset(EmuTime::param time)
{
        writeIO(0x94, 0, time);
}
 
void RomRetroHard31in1::writeIO(word /*port*/, byte value, EmuTime::param /*time*/)
{
        byte page = 2 * (value & 0x1F);
        // note: we use a mirrored configuration here on purpose.
        // Without this, H.E.R.O. doesn't work from the dump I got.
        setRom(0, page + 1);
        setRom(1, page + 0);
        setRom(2, page + 1);
        setRom(3, page + 0);
}
 
byte* RomRetroHard31in1::getWriteCacheLine(word /*address*/) const
{
        return unmappedWrite.data();
}
 
REGISTER_MSXDEVICE(RomRetroHard31in1, "RomRetroHard31in1");
 
} // namespace openmsx