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◆ main openmsx / src / memory / RomMSXtra.cc
1.5 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "RomMSXtra.hh"
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#include "serialize.hh"
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#include "xrange.hh"
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namespace openmsx {
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RomMSXtra::RomMSXtra(const DeviceConfig& config, Rom&& rom_)
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	: MSXRom(config, std::move(rom_))
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	, ram(config, getName() + " RAM", "MSXtra RAM", 0x0800)
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{
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	for (auto i : xrange(0x800)) {
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		ram[i] = (i & 1) ? 0x5a : 0xa5;
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	}
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}
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byte RomMSXtra::readMem(uint16_t address, EmuTime /*time*/)
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{
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	if ((0x4000 <= address) && (address < 0x6000)) {
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		return rom[address & 0x1fff];
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	} else if ((0x6000 <= address) && (address < 0x8000)) {
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		return ram[address & 0x07ff];
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	} else {
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		return 0xff;
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	}
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}
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const byte* RomMSXtra::getReadCacheLine(uint16_t address) const
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{
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	if ((0x4000 <= address) && (address < 0x6000)) {
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		return &rom[address & 0x1fff];
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	} else if ((0x6000 <= address) && (address < 0x8000)) {
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		return &ram[address & 0x07ff];
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	} else {
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		return unmappedRead.data();
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	}
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}
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// default peekMem() implementation is OK
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void RomMSXtra::writeMem(uint16_t address, byte value, EmuTime /*time*/)
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{
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	if ((0x6000 <= address) && (address < 0x8000)) {
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		ram[address & 0x07ff] = value;
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	}
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}
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byte* RomMSXtra::getWriteCacheLine(uint16_t address)
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{
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	if ((0x6000 <= address) && (address < 0x8000)) {
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		return &ram[address & 0x07ff];
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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 RomMSXtra::serialize(Archive& ar, unsigned /*version*/)
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{
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	// skip MSXRom base class
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	ar.template serializeBase<MSXDevice>(*this);
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	ar.serialize("ram", ram);
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}
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INSTANTIATE_SERIALIZE_METHODS(RomMSXtra);
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REGISTER_MSXDEVICE(RomMSXtra, "RomMSXtra");
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} // namespace openmsx