110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2009 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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* All regs access only by READ
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*
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* 5000 - I/O - when read, 0 goes to tape output
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* ---m3210
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* 3210 - lower scancode nibble
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* m - tape input bit
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* 5001 - I
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* ----7654
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* 7654 - higher scancode nibble
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* 5002 - I - reset scancode buffer, ready to new input
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* 5004 - O - when read, 1 goes to tape output
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*
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*/
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#include "mapinc.h"
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static uint8 *WRAM = NULL;
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static uint32 WRAMSIZE;
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char *GetKeyboard(void);
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static char *TransformerKeys, oldkeys[256];
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static int TransformerCycleCount, TransformerChar = 0;
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static void FP_FASTAPASS(1) TransformerIRQHook(int a) {
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TransformerCycleCount += a;
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if (TransformerCycleCount >= 1000) {
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uint32 i;
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TransformerCycleCount -= 1000;
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TransformerKeys = GetKeyboard();
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for (i = 0; i < 256; i++) {
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if (oldkeys[i] != TransformerKeys[i]) {
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if (oldkeys[i] == 0)
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TransformerChar = i;
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else
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TransformerChar = i | 0x80;
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X6502_IRQBegin(FCEU_IQEXT);
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memcpy((void*)&oldkeys[0], (void*)TransformerKeys, sizeof(oldkeys));
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break;
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}
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}
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}
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}
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static DECLFR(TransformerRead) {
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uint8 ret = 0;
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switch (A & 3) {
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case 0: ret = TransformerChar & 15; break;
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case 1: ret = (TransformerChar >> 4); break;
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case 2: X6502_IRQEnd(FCEU_IQEXT); break;
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case 4: break;
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}
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return ret;
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}
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static void TransformerPower(void) {
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setprg8r(0x10, 0x6000, 0);
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setprg16(0x8000, 0);
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setprg16(0xC000, ~0);
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setchr8(0);
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SetReadHandler(0x5000, 0x5004, TransformerRead);
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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MapIRQHook = TransformerIRQHook;
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}
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static void TransformerClose(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 Transformer_Init(CartInfo *info) {
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info->Power = TransformerPower;
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info->Close = TransformerClose;
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WRAMSIZE = 8192;
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WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
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if (info->battery) {
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info->SaveGame[0] = WRAM;
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info->SaveGameLen[0] = WRAMSIZE;
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}
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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}
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