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 "Rom.hh"
#include "serialize.hh"

namespace openmsx {

RomAscii8kB::RomAscii8kB(const DeviceConfig& config, std::unique_ptr<Rom> rom)
        : Rom8kBBlocks(config, std::move(rom))
{
        reset(EmuTime::dummy());
}

void RomAscii8kB::reset(EmuTime::param /*time*/)
{
        setUnmapped(0);
        setUnmapped(1);
        for (int i = 2; i < 6; i++) {
                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;
        }
}

REGISTER_MSXDEVICE(RomAscii8kB, "RomAscii8kB");

} // namespace openmsx