Mapper 268: Rewrite and add submapper variants.
This commit is contained in:
NewRisingSun
147
src/boards/268.c
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147
src/boards/268.c
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/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2022
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 *CHRRAM =NULL;
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static uint8 submapper;
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static void Mapper268_PRGWrap(uint32 A, uint8 V) {
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int prgMaskMMC3, prgMaskGNROM, prgOffset;
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prgMaskMMC3 =(EXPREGS[3] &0x10? 0x00: 0x0F) // PRG A13-A16
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|(EXPREGS[0] &0x40? 0x00: 0x10) // PRG A17
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|(EXPREGS[1] &0x80? 0x00: 0x20) // PRG A18
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|(EXPREGS[1] &0x40? 0x40: 0x00) // PRG A19
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|(EXPREGS[1] &0x20? 0x80: 0x00) // PRG A20
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;
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switch(submapper &~1) {
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default: /* Original implementation */
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prgMaskGNROM =EXPREGS[3] &0x10? (EXPREGS[1] &0x02? 0x03: 0x01): 0x00;
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prgOffset =EXPREGS[3] &0x00E
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|EXPREGS[0] <<4 &0x070
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|EXPREGS[1] <<3 &0x080
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|EXPREGS[1] <<6 &0x300
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|EXPREGS[0] <<6 &0xC00;
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break;
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case 2: /* Later revision with different arrangement of register 1 */
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prgMaskGNROM =EXPREGS[3] &0x10? (EXPREGS[1] &0x10? 0x01: 0x03): 0x00;
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prgOffset =EXPREGS[3] &0x00E
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|EXPREGS[0] <<4 &0x070
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|EXPREGS[1] <<4 &0x080
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|EXPREGS[1] <<7 &0x300
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|EXPREGS[0] <<6 &0xC00;
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break;
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case 4: /* LD622D: PRG A20-21 moved to register 0 */
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prgMaskGNROM =EXPREGS[3] &0x10? (EXPREGS[1] &0x10? 0x01: 0x03): 0x00;
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prgOffset =EXPREGS[3] &0x00E
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|EXPREGS[0] <<4 &0x070
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|EXPREGS[0] <<3 &0x180;
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break;
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case 6: /* J-852C: CHR A17 selects between two PRG chips */
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prgMaskGNROM =EXPREGS[3] &0x10? (EXPREGS[1] &0x02? 0x03: 0x01): 0x00;
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prgOffset =EXPREGS[3] &0x00E
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|EXPREGS[0] <<4 &0x070
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|EXPREGS[1] <<3 &0x080
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|EXPREGS[1] <<6 &0x300
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|EXPREGS[0] <<6 &0xC00;
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prgOffset &=ROM_size -1;
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if (EXPREGS[0] &0x80? !!(EXPREGS[0] &0x08): !!(DRegBuf[0] &0x80)) prgOffset |=ROM_size;
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break;
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}
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prgOffset &=~(prgMaskMMC3 | prgMaskGNROM);
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setprg8(A, V &prgMaskMMC3 | prgOffset | A >>13 &prgMaskGNROM);
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}
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static void Mapper268_CHRWrap(uint32 A, uint8 V) {
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int chrMaskMMC3, chrMaskGNROM, chrOffset;
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chrMaskMMC3 =EXPREGS[3] &0x10? 0x00: EXPREGS[0] &0x80? 0x7F: 0xFF;
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chrMaskGNROM =EXPREGS[3] &0x10? 0x07: 0x00;
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chrOffset =EXPREGS[0] <<4 &0x380 | EXPREGS[2] <<3 &0x078;
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chrOffset &=~(chrMaskMMC3 | chrMaskGNROM);
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setchr1r(CHRRAM && EXPREGS[4] &0x01 && (V &0xFE) ==(EXPREGS[4] &0xFE)? 0x10: 0x00, A, V &chrMaskMMC3 | chrOffset | A >>10 &chrMaskGNROM);
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}
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static DECLFR(Mapper268_ReadWRAM) {
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return A001B &0xA0? CartBR(A): X.DB;
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}
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static DECLFW(Mapper268_WriteWRAM) {
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if (A001B &0x80 && ~A001B &0x40 || A001B &0x20) CartBW(A, V);
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}
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static DECLFW(Mapper268_WriteReg) {
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if (~EXPREGS[3] &0x80 || EXPREGS[3] &0x10) {
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EXPREGS[A &7] =V;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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if (~submapper &1) Mapper268_WriteWRAM(A, V);
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}
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static void Mapper268_Reset(void) {
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EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =EXPREGS[4] =EXPREGS[5] =0;
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MMC3RegReset();
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}
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static void Mapper268_Power(void) {
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EXPREGS[0] =EXPREGS[1] =EXPREGS[2] =EXPREGS[3] =EXPREGS[4] =EXPREGS[5] =0;
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GenMMC3Power();
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SetReadHandler(0x6000, 0x7FFF, Mapper268_ReadWRAM);
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if (submapper &1) {
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SetWriteHandler(0x5000, 0x5FFF, Mapper268_WriteReg);
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SetWriteHandler(0x6000, 0x7FFF, Mapper268_WriteWRAM);
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} else
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SetWriteHandler(0x6000, 0x7FFF, Mapper268_WriteReg);
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}
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static void Mapper268_close(void) {
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if (CHRRAM) FCEU_gfree(CHRRAM);
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CHRRAM =NULL;
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}
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void Mapper268_Init(CartInfo *info) {
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submapper = info->submapper;
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GenMMC3_Init(info, 512, 256, (info->PRGRamSize +info->PRGRamSaveSize) >>10, info->battery);
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cwrap = Mapper268_CHRWrap;
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pwrap = Mapper268_PRGWrap;
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info->Power = Mapper268_Power;
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info->Reset = Mapper268_Reset;
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info->Close = Mapper268_close;
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AddExState(EXPREGS, 8, 0, "EXPR");
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if (info->CHRRomSize && info->CHRRamSize + info->CHRRamSaveSize) {
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CHRRAM =(uint8 *)FCEU_gmalloc(info->CHRRamSize + info->CHRRamSaveSize);
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SetupCartCHRMapping(0x10, CHRRAM, info->CHRRamSize + info->CHRRamSaveSize, 1);
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AddExState(CHRRAM, info->CHRRamSize + info->CHRRamSaveSize, 0, "CRAM");
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}
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}
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void COOLBOY_Init(CartInfo *info) {
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info->submapper =0;
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Mapper268_Init(info);
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}
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void MINDKIDS_Init(CartInfo *info) {
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info->submapper =1;
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Mapper268_Init(info);
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}
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@@ -1,185 +0,0 @@
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2015 CaH4e3, ClusteR
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* CoolBoy 400-in-1 FK23C-mimic mapper 16Mb/32Mb PROM + 128K/256K CHR RAM, optional SRAM, optional NTRAM
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* only MMC3 mode
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*
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* 6000 (xx76x210) | 0xC0
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* 6001 (xxx354x)
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* 6002 = 0
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* 6003 = 0
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*
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* hardware tested logic, don't try to understand lol
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static void COOLBOYCW(uint32 A, uint8 V) {
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uint32 mask = 0xFF ^ (EXPREGS[0] & 0x80);
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if (EXPREGS[3] & 0x10) {
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if (EXPREGS[3] & 0x40) { /* Weird mode */
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int cbase = (MMC3_cmd & 0x80) << 5;
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switch (cbase ^ A) { /* Don't even try to understand */
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case 0x0400:
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case 0x0C00: V &= 0x7F; break;
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}
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}
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/* Highest bit goes from MMC3 registers when EXPREGS[3]&0x80==0 or from EXPREGS[0]&0x08 otherwise */
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setchr1(A,
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(V & 0x80 & mask) | ((((EXPREGS[0] & 0x08) << 4) & ~mask)) /* 7th bit */
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| ((EXPREGS[2] & 0x0F) << 3) /* 6-3 bits */
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| ((A >> 10) & 7) /* 2-0 bits */
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);
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} else {
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if (EXPREGS[3] & 0x40) { /* Weird mode, again */
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int cbase = (MMC3_cmd & 0x80) << 5;
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switch (cbase ^ A) { /* Don't even try to understand */
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case 0x0000: V = DRegBuf[0]; break;
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case 0x0800: V = DRegBuf[1]; break;
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case 0x0400:
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case 0x0C00: V = 0; break;
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}
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}
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/* Simple MMC3 mode
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* Highest bit goes from MMC3 registers when EXPREGS[3]&0x80==0 or from EXPREGS[0]&0x08 otherwise
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*/
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setchr1(A, (V & mask) | (((EXPREGS[0] & 0x08) << 4) & ~mask));
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}
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}
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static void COOLBOYPW(uint32 A, uint8 V) {
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uint32 mask = ((0x3F | (EXPREGS[1] & 0x40) | ((EXPREGS[1] & 0x20) << 2)) ^ ((EXPREGS[0] & 0x40) >> 2)) ^ ((EXPREGS[1] & 0x80) >> 2);
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uint32 base = ((EXPREGS[0] & 0x07) >> 0) | ((EXPREGS[1] & 0x10) >> 1) | ((EXPREGS[1] & 0x0C) << 2) | ((EXPREGS[0] & 0x30) << 2);
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/* Very weird mode
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* Last banks are first in this mode, ignored when MMC3_cmd&0x40
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*/
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if ((EXPREGS[3] & 0x40) && (V >= 0xFE) && !((MMC3_cmd & 0x40) != 0)) {
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switch (A & 0xE000) {
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case 0xA000:
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if ((MMC3_cmd & 0x40)) V = 0;
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break;
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case 0xC000:
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if (!(MMC3_cmd & 0x40)) V = 0;
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break;
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case 0xE000:
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V = 0;
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break;
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}
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}
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/* Regular MMC3 mode, internal ROM size can be up to 2048kb! */
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if (!(EXPREGS[3] & 0x10))
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setprg8(A, (((base << 4) & ~mask)) | (V & mask));
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else { /* NROM mode */
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uint8 emask;
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mask &= 0xF0;
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if ((((EXPREGS[1] & 2) != 0))) /* 32kb mode */
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emask = (EXPREGS[3] & 0x0C) | ((A & 0x4000) >> 13);
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else /* 16kb mode */
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emask = EXPREGS[3] & 0x0E;
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setprg8(A, ((base << 4) & ~mask) /* 7-4 bits are from base (see below) */
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| (V & mask) /* ... or from MM3 internal regs, depends on mask */
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| emask /* 3-1 (or 3-2 when (EXPREGS[3]&0x0C is set) from EXPREGS[3] */
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| ((A & 0x2000) >> 13)); /* 0th just as is */
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}
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}
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static DECLFW(COOLBOYWrite) {
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if(A001B & 0x80)
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CartBW(A,V);
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/* Deny any further writes when 7th bit is 1 AND 4th is 0 */
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if ((EXPREGS[3] & 0x90) != 0x80) {
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EXPREGS[A & 3] = V;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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}
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static void COOLBOYReset(void) {
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MMC3RegReset();
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EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
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#if 0
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EXPREGS[0] = 0;
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EXPREGS[1] = 0x60;
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EXPREGS[2] = 0;
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EXPREGS[3] = 0;
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#endif
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static void COOLBOYPower(void) {
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GenMMC3Power();
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EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
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#if 0
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EXPREGS[0] = 0;
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EXPREGS[1] = 0x60;
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EXPREGS[2] = 0;
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EXPREGS[3] = 0;
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#endif
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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SetWriteHandler(0x5000, 0x5fff, CartBW); /* some games access random unmapped areas and crashes because of KT-008 PCB hack in MMC3 source lol */
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SetWriteHandler(0x6000, 0x7fff, COOLBOYWrite);
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}
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void COOLBOY_Init(CartInfo *info) {
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GenMMC3_Init(info, 512, 256, 8, 0);
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pwrap = COOLBOYPW;
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cwrap = COOLBOYCW;
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info->Power = COOLBOYPower;
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info->Reset = COOLBOYReset;
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AddExState(EXPREGS, 4, 0, "EXPR");
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}
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/*------------------ MINDKIDS ---------------------------*/
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/* A COOLBOY variant that works identically but puts the outer bank registers
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* in the $5xxx range instead of the $6xxx range.
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* The UNIF board name is MINDKIDS (submapper 1).
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* http://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_268
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*/
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static void MINDKIDSPower(void) {
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GenMMC3Power();
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EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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SetWriteHandler(0x5000, 0x5fff, COOLBOYWrite);
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}
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void MINDKIDS_Init(CartInfo *info) {
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GenMMC3_Init(info, 2048, 256, 8, info->battery);
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pwrap = COOLBOYPW;
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cwrap = COOLBOYCW;
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info->Power = MINDKIDSPower;
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info->Reset = COOLBOYReset;
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AddExState(EXPREGS, 4, 0, "EXPR");
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}
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void Mapper268_Init(CartInfo *info) {
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/* Technically, the distinction between COOLBOY ($6000-$7FFF) and MINDKIDS ($5000-$5FFF) is based on a solder pad setting. */
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/* In NES 2.0, the submapper field is used to distinguish between the two settings. */
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if (info->submapper == 1)
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MINDKIDS_Init(info);
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else
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COOLBOY_Init(info);
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}
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