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◆ main openmsx / src / memory / RomAscii16kB.cc
1.1 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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// ASCII 16kB cartridges
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//
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// this type is used in a few cartridges.
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// example of cartridges: Xevious, Fantasy Zone 2,
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// Return of Ishitar, Androgynus, Gallforce ...
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//
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// The address to change banks:
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//  first  16kb: 0x6000 - 0x67ff (0x6000 used)
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//  second 16kb: 0x7000 - 0x77ff (0x7000 and 0x77ff used)
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#include "RomAscii16kB.hh"
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#include "serialize.hh"
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namespace openmsx {
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RomAscii16kB::RomAscii16kB(const DeviceConfig& config, Rom&& rom_)
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	: Rom16kBBlocks(config, std::move(rom_))
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{
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	RomAscii16kB::reset(EmuTime::dummy());
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}
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void RomAscii16kB::reset(EmuTime /*time*/)
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{
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	setUnmapped(0);
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	setRom(1, 0);
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	setRom(2, 0);
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	setUnmapped(3);
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}
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void RomAscii16kB::writeMem(uint16_t address, byte value, EmuTime /*time*/)
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{
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	if ((0x6000 <= address) && (address < 0x7800) && !(address & 0x0800)) {
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		byte region = ((address >> 12) & 1) + 1;
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		setRom(region, value);
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	}
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}
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byte* RomAscii16kB::getWriteCacheLine(uint16_t address)
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{
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	if ((0x6000 <= address) && (address < 0x7800) && !(address & 0x0800)) {
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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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REGISTER_MSXDEVICE(RomAscii16kB, "RomAscii16kB");
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} // namespace openmsx