public int read(int address) {
if (address >= 0x0000 && address < 0x8000) {
return rom.read(address);
} else if (address >= ADDRESS_ERAM_START && address < ADDRESS_ERAM_4BIT_END && ramEnable) {
return eram.read(address);
}
return 0;
}
public void write(int address, int data) {
if (address >= 0x0000 && address < 0x2000) {
/* Writing to this address is supposed to enable/disable RAM. However, Pan Docs
* fails to explain which specific values enable and disable RAM. Therefore, RAM
* is treated as always ON.
*/
// TODO Find information on this.
} else if (address >= 0x2000 && address < 0x4000) {
if ((data & 0x10) == 0) {
setRomBank(data & 0x0F);
}
} else if (address >= ADDRESS_ERAM_START && address < ADDRESS_ERAM_4BIT_END && ramEnable) {
eram.write(address, data);
}
}
/** {@inheritDoc} */
public void saveState(FileOutputStream fos) throws IOException {
rom.saveState(fos);
eram.saveState(fos);
FileIOStreamHelper.writeData(fos, (long) romBank, 4);
FileIOStreamHelper.writeData(fos, (long) romBanks, 4);
}
/** {@inheritDoc} */
public void readState(FileInputStream fis) throws IOException {
rom.readState(fis);
eram.readState(fis);
romBank = (int) FileIOStreamHelper.readData(fis, 4);
romBanks = (int) FileIOStreamHelper.readData(fis, 4);
}