RomSynthesizer.cc

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/* On Sat, 3 Apr 2004, Manuel Pazos wrote:
 *
 * As you know, the cartridge has an 8bit D/A, accessed through
 * memory-mapped at address #4000 by the program. openMSX also uses that
 * address to access it. But examining the cartridge board I found that the
 * address is decoded by a LS138 in this way:
 *
 *    /WR = L
 *    A15 = L
 *    A4 = L
 *    /MERQ = L
 *    /SLT = L
 *    A14 = H
 *
 * So any value equal to %01xxxxxxxxx0xxxx should work (i.e.: #4000, #4020,
 * #7C00, etc.)
*/
 
#include "RomSynthesizer.hh"
#include "CacheLine.hh"
#include "serialize.hh"
 
namespace openmsx {
 
RomSynthesizer::RomSynthesizer(const DeviceConfig& config, Rom&& rom_)
        : Rom16kBBlocks(config, std::move(rom_))
        , dac("Synthesizer-DAC", "Konami Synthesizer's DAC", config)
{
        setUnmapped(0);
        setRom(1, 0);
        setRom(2, 1);
        setUnmapped(3);
 
        reset(getCurrentTime());
}
 
void RomSynthesizer::reset(EmuTime::param time)
{
        dac.reset(time);
}
 
void RomSynthesizer::writeMem(word address, byte value, EmuTime::param time)
{
        if ((address & 0xC010) == 0x4000) {
                dac.writeDAC(value, time);
        }
}
 
byte* RomSynthesizer::getWriteCacheLine(word address) const
{
        if ((address & 0xC010 & CacheLine::HIGH) == 0x4000) {
                return nullptr;
        } else {
                return unmappedWrite.data();
        }
}
 
template<typename Archive>
void RomSynthesizer::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<Rom16kBBlocks>(*this);
        ar.serialize("DAC", dac);
}
INSTANTIATE_SERIALIZE_METHODS(RomSynthesizer);
REGISTER_MSXDEVICE(RomSynthesizer, "RomSynthesizer");
 
} // namespace openmsx