package com.grapeshot.halfnes.mappers;
import com.grapeshot.halfnes.*;
public class Mapper97 extends Mapper {
@Override
public void loadrom() throws BadMapperException {
//needs to be in every mapper. Fill with initial cfg
super.loadrom();
//fixed bank
for (int i = 1; i <= 16; ++i) {
prg_map[16 - i] = prgsize - (1024 * i);
}
//swappable bank
for (int i = 0; i < 16; ++i) {
prg_map[16 + 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 < 0x8000 || addr > 0xffff) {
super.cartWrite(addr, data);
return;
}
int prgselect = (byte) (data & 0xF);
//remap PRG bank
for (int i = 0; i < 16; ++i) {
prg_map[16 + i] = (1024 * (i + 16 * prgselect)) & (prgsize - 1);
}
int mirroring = data >> 6;
switch (mirroring) {
case 0:
setmirroring(MirrorType.SS_MIRROR0);
break;
case 1:
setmirroring(MirrorType.H_MIRROR);
break;
case 2:
setmirroring(MirrorType.V_MIRROR);
break;
case 3:
setmirroring(MirrorType.SS_MIRROR1);
break;
}
}
}