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NES: Mapper 165 from VirtuaNES (not working correctly yet) (#194)
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‎retro-core/components/nofrendo/mappers/map165.c‎

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/*
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** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
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**
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of version 2 of the GNU Library General
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** Public License as published by the Free Software Foundation.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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** Library General Public License for more details. To obtain a
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** copy of the GNU Library General Public License, write to the Free
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** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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** Any permitted reproduction of these routines, in whole or in part,
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** must bear this legend.
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**
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**
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** map165.c: Fire Emblem mapper
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** Code adapted from VirtuaNES (GPLv2)
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**
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*/
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#include "nes/nes.h"
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static uint8_t reg[8];
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static uint8_t prg0, prg1;
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static uint8_t chr0, chr1, chr2, chr3;
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static uint8_t we_sram;
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static uint8_t latch;
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static void SetPROM_8K_Bank(int page, int bank)
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{
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// CPU_MEM_BANK[page] = PROM+0x2000*bank;
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// CPU_MEM_TYPE[page] = BANKTYPE_ROM;
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// CPU_MEM_PAGE[page] = bank;
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mmc_bankprg(8, 0x2000 * page, bank, PRG_ROM);
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}
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static void SetBank_CPU(void)
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{
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SetPROM_8K_Bank(4, prg0);
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SetPROM_8K_Bank(5, prg1);
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SetPROM_8K_Bank(6, -2); // PROM_8K_SIZE - 2
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SetPROM_8K_Bank(7, -1); // PROM_8K_SIZE - 1
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}
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static void SetBank_PPUSUB(int bank, int page)
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{
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if (page == 0)
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{
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// SetCRAM_4K_Bank(bank, page >> 2);
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mmc_bankchr(4, 0x0400 * bank, page >> 2, CHR_RAM);
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}
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else
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{
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// SetVROM_4K_Bank(bank, page >> 2);
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mmc_bankchr(4, 0x0400 * bank, page >> 2, CHR_ROM);
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}
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}
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static void SetBank_PPU(void)
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{
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if (latch == 0xFD)
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{
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SetBank_PPUSUB(0, chr0);
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SetBank_PPUSUB(4, chr2);
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}
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else
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{
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SetBank_PPUSUB(0, chr1);
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SetBank_PPUSUB(4, chr3);
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}
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}
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static void PPU_ChrLatch(uint32 addr, uint8 data)
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{
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uint32_t mask = addr & 0x1FF0;
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if (mask == 0x1FD0)
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{
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latch = 0xFD;
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SetBank_PPU();
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}
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else if (mask == 0x1FE0)
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{
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latch = 0xFE;
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SetBank_PPU();
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}
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}
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static void map_write(uint32 addr, uint8 data)
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{
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switch (addr & 0xE001)
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{
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case 0x8000:
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reg[0] = data;
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SetBank_CPU();
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SetBank_PPU();
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break;
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case 0x8001:
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reg[1] = data;
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switch (reg[0] & 0x07)
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{
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case 0x00:
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chr0 = data & 0xFC;
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if (latch == 0xFD)
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SetBank_PPU();
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break;
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case 0x01:
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chr1 = data & 0xFC;
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if (latch == 0xFE)
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SetBank_PPU();
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break;
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case 0x02:
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chr2 = data & 0xFC;
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if (latch == 0xFD)
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SetBank_PPU();
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break;
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case 0x04:
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chr3 = data & 0xFC;
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if (latch == 0xFE)
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SetBank_PPU();
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break;
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case 0x06:
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prg0 = data;
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SetBank_CPU();
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break;
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case 0x07:
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prg1 = data;
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SetBank_CPU();
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break;
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}
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break;
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case 0xA000:
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reg[2] = data;
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if (data & 0x01)
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ppu_setmirroring(PPU_MIRROR_HORI);
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else
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ppu_setmirroring(PPU_MIRROR_VERT);
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break;
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case 0xA001:
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reg[3] = data;
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break;
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default:
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break;
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}
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}
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static void map_getstate(uint8 *state)
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{
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for (int i = 0; i < 8; i++)
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state[i] = reg[i];
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state[8] = prg0;
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state[9] = prg1;
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state[10] = chr0;
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state[11] = chr1;
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state[12] = chr2;
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state[13] = chr3;
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state[14] = latch;
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}
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static void map_setstate(uint8 *state)
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{
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for (int i = 0; i < 8; i++)
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reg[i] = state[i];
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prg0 = state[8];
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prg1 = state[9];
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chr0 = state[10];
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chr1 = state[11];
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chr2 = state[12];
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chr3 = state[13];
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latch = state[14];
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}
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static void map_init(rom_t *cart)
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{
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for (int i = 0; i < 8; i++)
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reg[i] = 0x00;
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prg0 = 0;
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prg1 = 1;
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SetBank_CPU();
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chr0 = 0;
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chr1 = 0;
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chr2 = 4;
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chr3 = 4;
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latch = 0xFD;
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SetBank_PPU();
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we_sram = 0; // Disable
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ppu_setlatchfunc(PPU_ChrLatch);
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}
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mapintf_t map165_intf =
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{
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.number = 165,
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.name = "Mapper 165",
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.init = map_init,
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.vblank = NULL,
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.hblank = NULL,
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.get_state = map_getstate,
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.set_state = map_setstate,
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.mem_read = {},
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.mem_write = {
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{0x8000, 0xFFFF, map_write},
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},
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};

‎retro-core/components/nofrendo/mappers/mappers.h‎

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Original file line numberDiff line numberDiff line change
@@ -52,6 +52,7 @@ extern mapintf_t map119_intf;
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extern mapintf_t map160_intf;
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extern mapintf_t map162_intf;
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extern mapintf_t map163_intf;
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extern mapintf_t map165_intf;
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extern mapintf_t map176_intf;
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extern mapintf_t map185_intf;
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extern mapintf_t map191_intf;
@@ -116,6 +117,7 @@ static const mapintf_t *mappers[] =
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&map160_intf,
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&map162_intf,
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&map163_intf,
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&map165_intf,
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&map176_intf,
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&map185_intf,
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&map191_intf,

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