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◆ main openmsx / src / memory / RomSynthesizer.cc
1.5 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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/* On Sat, 3 Apr 2004, Manuel Pazos wrote:
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 *
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 * As you know, the cartridge has an 8bit D/A, accessed through
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 * memory-mapped at address #4000 by the program. openMSX also uses that
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 * address to access it. But examining the cartridge board I found that the
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 * address is decoded by a LS138 in this way:
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 *
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 *    /WR = L
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 *    A15 = L
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 *    A4 = L
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 *    /MERQ = L
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 *    /SLT = L
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 *    A14 = H
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 *
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 * So any value equal to %01xxxxxxxxx0xxxx should work (i.e.: #4000, #4020,
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 * #7C00, etc.)
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*/
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#include "RomSynthesizer.hh"
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#include "CacheLine.hh"
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#include "serialize.hh"
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namespace openmsx {
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RomSynthesizer::RomSynthesizer(const DeviceConfig& config, Rom&& rom_)
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	: Rom16kBBlocks(config, std::move(rom_))
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	, dac("Synthesizer-DAC", "Konami Synthesizer's DAC", config)
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{
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	setUnmapped(0);
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	setRom(1, 0);
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	setRom(2, 1);
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	setUnmapped(3);
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	reset(getCurrentTime());
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}
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void RomSynthesizer::reset(EmuTime time)
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{
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	dac.reset(time);
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}
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void RomSynthesizer::writeMem(uint16_t address, byte value, EmuTime time)
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{
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	if ((address & 0xC010) == 0x4000) {
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		dac.writeDAC(value, time);
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	}
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}
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byte* RomSynthesizer::getWriteCacheLine(uint16_t address)
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{
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	if ((address & 0xC010 & CacheLine::HIGH) == 0x4000) {
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		return nullptr;
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	} else {
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		return unmappedWrite.data();
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	}
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}
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template<typename Archive>
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void RomSynthesizer::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<Rom16kBBlocks>(*this);
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	ar.serialize("DAC", dac);
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}
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INSTANTIATE_SERIALIZE_METHODS(RomSynthesizer);
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REGISTER_MSXDEVICE(RomSynthesizer, "RomSynthesizer");
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} // namespace openmsx