preliminary, basic hookup of Family Network System base board + MMC1 cassette emulation
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g0me3
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4fe5da841c
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18165938d4
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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) 1998 BERO
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* Copyright (C) 2002 Xodnizel
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* Copyright (C) 2020 CaH4e3
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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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* Famicom Network System Base Unit + MMC1 cartridge board
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*
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*/
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#include "mapinc.h"
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static uint8 DRegs[4];
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static uint8 Buffer, BufferShift;
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static uint32 WRAMSIZE;
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static uint8 *WRAM = NULL;
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static int kanji_pos, kanji_page, r40C0;
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static int IRQa, IRQCount;
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static DECLFW(MBWRAM) {
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if (!(DRegs[3] & 0x10))
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Page[A >> 11][A] = V;
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}
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static DECLFR(MAWRAM) {
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if (DRegs[3] & 0x10)
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return X.DB;
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return(Page[A >> 11][A]);
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}
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static void MMC1CHR(void) {
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setchr8((r40C0 >> 3) & 1);
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}
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static void MMC1PRG(void) {
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uint8 offs_16banks = DRegs[1] & 0x10;
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uint8 prg_reg = DRegs[3] & 0xF;
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setprg8r(0x10, 0x6000, DRegs[1] & 3);
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switch (DRegs[0] & 0xC) {
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case 0xC:
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setprg16(0x8000, (prg_reg + offs_16banks));
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setprg16(0xC000, 0xF + offs_16banks);
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break;
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case 0x8:
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setprg16(0xC000, (prg_reg + offs_16banks));
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setprg16(0x8000, offs_16banks);
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break;
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case 0x0:
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case 0x4:
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setprg16(0x8000, ((prg_reg & ~1) + offs_16banks));
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setprg16(0xc000, ((prg_reg & ~1) + offs_16banks + 1));
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break;
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}
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}
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static void MMC1MIRROR(void) {
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switch (DRegs[0] & 3) {
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case 2: setmirror(MI_V); break;
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case 3: setmirror(MI_H); break;
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case 0: setmirror(MI_0); break;
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case 1: setmirror(MI_1); break;
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}
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}
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static uint64 lreset;
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static DECLFW(MMC1_write) {
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int n = (A >> 13) - 4;
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if ((timestampbase + timestamp) < (lreset + 2))
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return;
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if (V & 0x80) {
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DRegs[0] |= 0xC;
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BufferShift = Buffer = 0;
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MMC1PRG();
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lreset = timestampbase + timestamp;
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return;
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}
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Buffer |= (V & 1) << (BufferShift++);
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if (BufferShift == 5) {
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DRegs[n] = Buffer;
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// FCEU_printf("MMC1 REG%d:%02x\n", n, Buffer);
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BufferShift = Buffer = 0;
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switch (n) {
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case 0: MMC1MIRROR(); // break;
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case 1: // break;
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// case 2: MMC1CHR(); break;
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case 3: MMC1PRG(); break;
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}
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}
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}
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static void MMC1_Restore(int version) {
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MMC1MIRROR();
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MMC1CHR();
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MMC1PRG();
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lreset = 0;
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}
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static void MMC1CMReset(void) {
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int i;
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for (i = 0; i < 4; i++)
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DRegs[i] = 0;
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Buffer = BufferShift = 0;
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DRegs[0] = 0x1F;
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DRegs[1] = 0;
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DRegs[2] = 0;
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DRegs[3] = 0;
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MMC1MIRROR();
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MMC1CHR();
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MMC1PRG();
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}
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static DECLFW(FNC_cmd_write) {
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switch (A) {
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case 0x40A6: {
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IRQCount = (IRQCount & 0xFF00) | V;
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break;
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}
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case 0x40A7: {
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IRQCount = (IRQCount & 0x00FF) | (V << 8);
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break;
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}
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case 0x40A8: {
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IRQa = V;
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break;
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}
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case 0x40B0: {
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kanji_page = V & 1;
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break;
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}
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case 0x40C0: {
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// FCEU_printf("FNS W %04x:%02x\n", A, V);
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r40C0 = V;
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MMC1CHR();
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break;
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}
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// default:
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// FCEU_printf("FNS W %04x:%02x\n", A, V);
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}
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}
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static DECLFR(FNC_stat_read) {
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switch (A) {
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case 0x40A2: {
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int ret = (IRQa >> 1);
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X6502_IRQEnd(FCEU_IQEXT);
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IRQa = 0;
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return ret;
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}
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case 0x40B0: {
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kanji_pos = 0;
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return 0;
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}
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case 0x40C0: {
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// FCEU_printf("FNS R %04x\n", A);
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int ret = r40C0;
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r40C0 &= 0;
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return ret;
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}
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default: {
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// FCEU_printf("FNS R %04x\n", A);
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return 0xff;
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}
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}
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}
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static DECLFR(FNC_kanji_read) {
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int32 ofs = ((A & 0xFFF) << 5) + kanji_pos;
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kanji_pos++;
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kanji_pos &= 0x1F;
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// if (PRGptr[1] != NULL) // iNES debug
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return PRGptr[1][ofs];
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// else
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// return CHRptr[0][ofs];
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}
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void NFC_IRQ(int a) {
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if (IRQa) {
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IRQCount -= a;
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if (IRQCount <= 0)
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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static void FNS_Power(void) {
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lreset = 0;
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SetWriteHandler(0x8000, 0xFFFF, MMC1_write);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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kanji_page = 0;
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kanji_pos = 0;
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r40C0 = 0xC0;
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SetWriteHandler(0x4080, 0x40FF, FNC_cmd_write);
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SetReadHandler(0x4080, 0x40FF, FNC_stat_read);
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SetReadHandler(0x5000, 0x5FFF, FNC_kanji_read);
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SetReadHandler(0x6000, 0x7FFF, MAWRAM);
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SetWriteHandler(0x6000, 0x7FFF, MBWRAM);
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FCEU_CheatAddRAM(8, 0x6000, WRAM);
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MMC1CMReset();
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}
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static void FNS_Close(void) {
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if (WRAM)
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FCEU_gfree(WRAM);
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WRAM = NULL;
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}
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void FNS_Init(CartInfo *info) {
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info->Close = FNS_Close;
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info->Power = FNS_Power;
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GameStateRestore = MMC1_Restore;
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MapIRQHook = NFC_IRQ;
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WRAMSIZE = (8 + 32) * 1024;
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WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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info->SaveGame[0] = WRAM;
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info->SaveGameLen[0] = WRAMSIZE;
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AddExState(DRegs, 4, 0, "DREG");
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AddExState(&lreset, 8, 1, "LRST");
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AddExState(&Buffer, 1, 1, "BFFR");
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AddExState(&BufferShift, 1, 1, "BFRS");
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}
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{
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if (wp.endaddress) {
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if ((wp.address <= _PC) && (wp.endaddress >= _PC))
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return false; //forbid
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return false; // forbid
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}
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else {
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if (wp.address == _PC)
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return false; //forbid
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return false; // forbid
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}
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}
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}
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{ "80013-B", BMC80013B_Init, 0 },
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{ "HPxx", BMCHPxx_Init, 0 },
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{ "MINDKIDS", MINDKIDS_Init, BMCFLAG_256KCHRR },
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{ "FNS", FNS_Init, BMCFLAG_16KCHRR },
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{ 0, 0, 0 }
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};
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@ -159,6 +159,7 @@ void BMC8IN1_Init(CartInfo *info);
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void BMC80013B_Init(CartInfo *info);
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void BMCHPxx_Init(CartInfo *info);
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void MINDKIDS_Init(CartInfo *info);
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void FNS_Init(CartInfo *info);
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extern uint8 *UNIFchrrama; // Meh. So I can stop CHR RAM
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// bank switcherooing with certain boards...
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@ -458,6 +458,7 @@
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<ClCompile Include="..\src\boards\F-15.cpp" />
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<ClCompile Include="..\src\boards\famicombox.cpp" />
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<ClCompile Include="..\src\boards\ffe.cpp" />
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<ClCompile Include="..\src\boards\fns.cpp" />
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<ClCompile Include="..\src\boards\hp10xx_hp20xx.cpp" />
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<ClCompile Include="..\src\boards\hp898f.cpp" />
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<ClCompile Include="..\src\boards\ks7010.cpp" />
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@ -1099,6 +1099,9 @@
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<ClCompile Include="..\src\input\fns.cpp">
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<Filter>input</Filter>
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</ClCompile>
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<ClCompile Include="..\src\boards\fns.cpp">
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<Filter>boards</Filter>
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</ClCompile>
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</ItemGroup>
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<ItemGroup>
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<ClInclude Include="..\src\drivers\common\args.h">
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