Mapper200.java

package com.grapeshot.halfnes.mappers;

import com.grapeshot.halfnes.*;

public class Mapper200 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 < 16; ++i) {
            prg_map[i] = (1024 * i) & (prgsize - 1);
        }
        for (int i = 0; i < 8; ++i) {
            chr_map[i] = (1024 * i) & (chrsize - 1);
        }
    }

    @Override
    public int cartRead(final int addr) {
        // by default has wram at 0x6000 and cartridge at 0x8000-0xfff
        // but some mappers have different so override for those
        if (addr < 0x4000) {
            return prg[prg_map[((addr & 0x3fff)) >> 10] + (addr & 1023)];
        } else {
            return prg[prg_map[((addr & 0x3fff)) >> 10] + ((addr - 0x4000) & 1023)];
        }
    }

    @Override
    public final void cartWrite(final int addr, final int data) {
        if (addr < 0x8000 || addr > 0xffff) {
            super.cartWrite(addr, data);
            return;
        }

        int reg = addr & 7;

        setmirroring(((data & (utils.BIT3)) != 0) ? MirrorType.H_MIRROR : MirrorType.V_MIRROR);

        //remap CHR bank
        for (int i = 0; i < 8; ++i) {
            chr_map[i] = (1024 * (i + 8 * reg)) & (chrsize - 1);
        }
        //remap PRG bank
        for (int i = 0; i < 16; ++i) {
            prg_map[i] = (1024 * (i + 16 * reg)) & (prgsize - 1);
        }
    }
}