Mapper246.java

package com.grapeshot.halfnes.mappers;

import com.grapeshot.halfnes.*;

public class Mapper246 extends Mapper {

    @Override
    public void loadrom() throws BadMapperException {
        //needs to be in every mapper. Fill with initial cfg
        super.loadrom();
        //swappable bank
        for (int i = 0; i < 24; ++i) {
            prg_map[i] = (1024 * i) & (prgsize - 1);
        }
        //fixed bank
        for (int i = 1; i <= 8; ++i) {
            prg_map[32 - i] = prgsize - (1024 * i);
        }
        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 < 0x6000 || addr > 0x67ff) {
            super.cartWrite(addr, data);
            return;
        }
        switch (addr & 7) {
            case 0:
                for (int i = 0; i < 8; ++i) {
                    prg_map[i] = (1024 * (i + 8 * data)) & (prgsize - 1);
                }
                break;
            case 1:
                for (int i = 0; i < 8; ++i) {
                    prg_map[8 + i] = (1024 * (i + 8 * data)) & (prgsize - 1);
                }
                break;
            case 2:
                for (int i = 0; i < 8; ++i) {
                    prg_map[16 + i] = (1024 * (i + 8 * data)) & (prgsize - 1);
                }
                break;
            case 3:
                for (int i = 0; i < 8; ++i) {
                    prg_map[24 + i] = (1024 * (i + 8 * data)) & (prgsize - 1);
                }
                break;
            case 4:
                for (int i = 0; i < 2; ++i) {
                    chr_map[i] = (1024 * (i + 2 * data)) & (chrsize - 1);
                }
                break;
            case 5:
                for (int i = 0; i < 2; ++i) {
                    chr_map[2 + i] = (1024 * (i + 2 * data)) & (chrsize - 1);
                }
                break;
            case 6:
                for (int i = 0; i < 2; ++i) {
                    chr_map[4 + i] = (1024 * (i + 2 * data)) & (chrsize - 1);
                }
                break;
            case 7:
                for (int i = 0; i < 2; ++i) {
                    chr_map[6 + i] = (1024 * (i + 2 * data)) & (chrsize - 1);
                }
                break;
        }
    }
}