/*
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
**
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of version 2 of the GNU Library General
** Public License as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Library General Public License for more details.  To obtain a
** copy of the GNU Library General Public License, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
**
**
** map075.c: Konami VRC1 mapper interface
**
*/

#include "nes/nes.h"

static uint8 latch[2];
static uint8 hibits;


static void map_write(uint32 address, uint8 value)
{
    switch ((address & 0xF000) >> 12)
    {
    case 0x8:
        mmc_bankrom(8, 0x8000, value);
        break;

    case 0x9:
        hibits = (value & 0x06);

        mmc_bankvrom(4, 0x0000, ((hibits & 0x02) << 3) | latch[0]);
        mmc_bankvrom(4, 0x1000, ((hibits & 0x04) << 2) | latch[1]);

        if (value & 1)
            ppu_setmirroring(PPU_MIRROR_VERT);
        else
            ppu_setmirroring(PPU_MIRROR_HORI);

        break;

    case 0xA:
        mmc_bankrom(8, 0xA000, value);
        break;

    case 0xC:
        mmc_bankrom(8, 0xC000, value);
        break;

    case 0xE:
        latch[0] = (value & 0x0F);
        mmc_bankvrom(4, 0x0000, ((hibits & 0x02) << 3) | latch[0]);
        break;

    case 0xF:
        latch[1] = (value & 0x0F);
        mmc_bankvrom(4, 0x1000, ((hibits & 0x04) << 2) | latch[1]);
        break;

    default:
        break;
    }
}


mapintf_t map75_intf =
{
    .number     = 75,
    .name       = "Konami VRC1",
    .init       = NULL,
    .vblank     = NULL,
    .hblank     = NULL,
    .get_state  = NULL,
    .set_state  = NULL,
    .mem_read   = {},
    .mem_write  = {
        { 0x8000, 0xFFFF, map_write }
    },
};
