NINA_003_006_Mapper.java

package com.grapeshot.halfnes.mappers;

import com.grapeshot.halfnes.*;

public class NINA_003_006_Mapper extends Mapper {

    boolean m113 = true;

    public NINA_003_006_Mapper(int mappernum) {
        super();
        switch (mappernum) {
            //mappers 79 and 113 differ mainly on whether they can control mirroring or not
            case 79:
                m113 = false;
                break;
            case 113:
                m113 = true;
                break;
        }
    }

    @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 reset() {
        for (int i = 0x4100; i < 0x6000; i += 0x200) {
            cartWrite(i, i + 0xFF);
        }
    }

    @Override
    public final void cartWrite(final int addr, final int data) {
        if (addr < 0x4100 || addr > 0x5fff) {
            super.cartWrite(addr, data);
            return;
        }

        if (m113) {
            setmirroring(((data & (utils.BIT7)) != 0) ? MirrorType.V_MIRROR : MirrorType.H_MIRROR);

            //remap CHR bank
            for (int i = 0; i < 8; ++i) {
                chr_map[i] = (1024 * (i + 8 * ((data >> 3 & 8) | (data & 7)))) & (chrsize - 1);
            }
            //remap PRG bank
            for (int i = 0; i < 32; ++i) {
                prg_map[i] = (1024 * (i + 32 * (data >> 3 & 7))) & (prgsize - 1);
            }
        } else {
            //remap CHR bank
            for (int i = 0; i < 8; ++i) {
                chr_map[i] = (1024 * (i + 8 * data)) & (chrsize - 1);
            }
            //remap PRG bank
            for (int i = 0; i < 32; ++i) {
                prg_map[i] = (1024 * (i + 32 * (data >> 3))) & (prgsize - 1);
            }
        }
    }
}