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Mapper 235 update support for 1MB/2MB carts and cart with unrom block

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This commit is contained in:
negativeExponent
2020-02-22 21:37:34 +08:00
parent fef34bda90
commit 0979e66e1c
3 changed files with 77 additions and 13 deletions
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83
src/boards/235.c
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@@ -2,6 +2,7 @@
*
* Copyright notice for this file:
* Copyright (C) 2005 CaH4e3
* Copyright (C) 2020 negativeExponent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -19,35 +20,76 @@
*/
#include "mapinc.h"
#include "../ines.h"
static uint8 *CHRRAM;
static uint32 CHRRAMSIZE;
static uint16 cmdreg;
static uint8 unrom, reg, type, openbus;
static SFORMAT StateRegs[] =
{
{ &cmdreg, 2, "CREG" },
{ &cmdreg, 2 | FCEUSTATE_RLSB, "CREG" },
{ &unrom, 1, "UNRM" },
{ &reg, 1, "UNRG" },
{ &type, 1, "TYPE" },
{ &openbus, 1, "OPNB" },
{ 0 }
};
static void Sync(void) {
if (cmdreg & 0x400)
setmirror(MI_0);
else
setmirror(((cmdreg >> 13) & 1) ^ 1);
if (cmdreg & 0x800) {
setprg16(0x8000, ((cmdreg & 0x300) >> 3) | ((cmdreg & 0x1F) << 1) | ((cmdreg >> 12) & 1));
setprg16(0xC000, ((cmdreg & 0x300) >> 3) | ((cmdreg & 0x1F) << 1) | ((cmdreg >> 12) & 1));
} else
setprg32(0x8000, ((cmdreg & 0x300) >> 4) | (cmdreg & 0x1F));
if (type && unrom) {
setprg16(0x8000, 0x80 | reg & 7);
setprg16(0xC000, 0x80 | 7);
setchr8(0);
setmirror(MI_V);
} else {
uint8 bank = ((cmdreg & 0x300) >> 3) | (cmdreg & 0x1F);
if (cmdreg & 0x400)
setmirror(MI_0);
else
setmirror(((cmdreg >> 13) & 1) ^ 1);
if (bank >= PRGsize[0] / 32768)
openbus = 1;
else if (cmdreg & 0x800) {
setprg16(0x8000, (bank << 1) | ((cmdreg >> 12) & 1));
setprg16(0xC000, (bank << 1) | ((cmdreg >> 12) & 1));
} else
setprg32(0x8000, bank);
setchr8(0);
}
}
static DECLFR(M235Read) {
if (openbus) {
openbus = 0;
return X.DB;
}
return CartBR(A);
}
static DECLFW(M235Write) {
cmdreg = A;
reg = V;
Sync();
}
static void M235Close(void) {
if (CHRRAM)
free(CHRRAM);
CHRRAM = NULL;
}
static void M235Reset(void) {
cmdreg = 0;
unrom = (unrom + type) & 1;
Sync();
}
static void M235Power(void) {
setchr8(0);
SetWriteHandler(0x8000, 0xFFFF, M235Write);
SetReadHandler(0x8000, 0xFFFF, CartBR);
SetReadHandler(0x8000, 0xFFFF, M235Read);
cmdreg = 0;
Sync();
}
@@ -57,7 +99,24 @@ static void M235Restore(int version) {
}
void Mapper235_Init(CartInfo *info) {
info->Reset = M235Reset;
info->Power = M235Power;
info->Close = M235Close;
GameStateRestore = M235Restore;
AddExState(&StateRegs, ~0, 0, 0);
/* some nes 2.0 header do can have no chr-ram.
* one such cart is 210-in-1 and Contra 4-in-1 (212-in-1,212 Hong Kong,Reset Based)(Unl).nes (0x745A6791)
*/
if (CHRsize[0] == 0) {
CHRRAMSIZE = 8192;
CHRRAM = (uint8*)FCEU_gmalloc(CHRRAMSIZE);
SetupCartCHRMapping(0, CHRRAM, CHRRAMSIZE, 1);
AddExState(CHRRAM, CHRRAMSIZE, 0, "CRAM");
}
type = 0;
/* carts with unrom game, reset-based */
if ((info->CRC32) == 0x745A6791) /* 210-in-1 and Contra 4-in-1 (212-in-1,212 Hong Kong,Reset Based)(Unl).nes */
type = 1;
}