RomAscii16kB.cc

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// ASCII 16kB cartridges
//
// this type is used in a few cartridges.
// example of cartridges: Xevious, Fantasy Zone 2,
// Return of Ishitar, Androgynus, Gallforce ...
//
// The address to change banks:
//  first  16kb: 0x6000 - 0x67ff (0x6000 used)
//  second 16kb: 0x7000 - 0x77ff (0x7000 and 0x77ff used)
 
#include "RomAscii16kB.hh"
#include "serialize.hh"
 
namespace openmsx {
 
RomAscii16kB::RomAscii16kB(const DeviceConfig& config, Rom&& rom_)
        : Rom16kBBlocks(config, std::move(rom_))
{
        RomAscii16kB::reset(EmuTime::dummy());
}
 
void RomAscii16kB::reset(EmuTime::param /*time*/)
{
        setUnmapped(0);
        setRom(1, 0);
        setRom(2, 0);
        setUnmapped(3);
}
 
void RomAscii16kB::writeMem(word address, byte value, EmuTime::param /*time*/)
{
        if ((0x6000 <= address) && (address < 0x7800) && !(address & 0x0800)) {
                byte region = ((address >> 12) & 1) + 1;
                setRom(region, value);
        }
}
 
byte* RomAscii16kB::getWriteCacheLine(word address)
{
        if ((0x6000 <= address) && (address < 0x7800) && !(address & 0x0800)) {
                return nullptr;
        } else {
                return unmappedWrite.data();
        }
}
 
REGISTER_MSXDEVICE(RomAscii16kB, "RomAscii16kB");
 
} // namespace openmsx