package com.grapeshot.halfnes.mappers;
import com.grapeshot.halfnes.*;
public class NINA_001_Mapper extends Mapper {
@Override
public void loadrom() throws BadMapperException {
//needs to be in every mapper. Fill with initial cfg
super.loadrom();
for (int i = 0; i < 32; ++i) {
prg_map[i] = (1024 * i) & (prgsize - 1);
}
for (int i = 0; i < 8; ++i) {
chr_map[i] = (1024 * i) & (chrsize - 1);
}
}
@Override
public final void cartWrite(final int addr, final int data) {
if (addr < 0x7ffd || addr > 0x7fff) {
super.cartWrite(addr, data);
return;
}
switch (addr) {
case 0x7FFD:
for (int i = 0; i < 32; ++i) {
prg_map[i] = (1024 * (i + 32 * data)) & (prgsize - 1);
}
break;
case 0x7FFE:
for (int i = 0; i < 4; ++i) {
chr_map[i] = (1024 * (i + 4 * data)) & (chrsize - 1);
}
break;
case 0x7FFF:
for (int i = 0; i < 4; ++i) {
chr_map[4 + i] = (1024 * (i + 4 * data)) & (chrsize - 1);
}
break;
}
}
}