RomAscii8kB.cc

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// ASCII 8kB cartridges
//
// this type is used in many japanese-only cartridges.
// example of cartridges: Valis(Fantasm Soldier), Dragon Slayer, Outrun,
//                        Ashguine 2, ...
// The address to change banks:
//  bank 1: 0x6000 - 0x67ff (0x6000 used)
//  bank 2: 0x6800 - 0x6fff (0x6800 used)
//  bank 3: 0x7000 - 0x77ff (0x7000 used)
//  bank 4: 0x7800 - 0x7fff (0x7800 used)
 
#include "RomAscii8kB.hh"
#include "serialize.hh"
#include "xrange.hh"
 
namespace openmsx {
 
RomAscii8kB::RomAscii8kB(const DeviceConfig& config, Rom&& rom_)
        : Rom8kBBlocks(config, std::move(rom_))
{
        RomAscii8kB::reset(EmuTime::dummy());
}
 
void RomAscii8kB::reset(EmuTime::param /*time*/)
{
        setUnmapped(0);
        setUnmapped(1);
        for (auto i : xrange(2, 6)) {
                setRom(i, 0);
        }
        setUnmapped(6);
        setUnmapped(7);
}
 
void RomAscii8kB::writeMem(word address, byte value, EmuTime::param /*time*/)
{
        if ((0x6000 <= address) && (address < 0x8000)) {
                byte region = ((address >> 11) & 3) + 2;
                setRom(region, value);
        }
}
 
byte* RomAscii8kB::getWriteCacheLine(word address) const
{
        if ((0x6000 <= address) && (address < 0x8000)) {
                return nullptr;
        } else {
                return unmappedWrite.data();
        }
}
 
REGISTER_MSXDEVICE(RomAscii8kB, "RomAscii8kB");
 
} // namespace openmsx